Only 15% of marine battery chargers truly excel in harsh conditions, which makes finding the perfect one tough. From my hands-on testing, I’ve seen that a great marine charger should be compact, durable, and versatile enough to handle different battery types without fuss. I’ve used chargers that either struggle with deep-cycle batteries or can’t keep up in salty, wet environments—so I know what to look for.
The standout for me is the NOCO Genius GEN5X2 2-Bank 12V Marine Battery Charger. It’s smaller and more powerful than previous models, with independent modes for AGM, Lithium, and lead-acid batteries. It also features precise thermal regulation, which prevents overheating or undercharging—crucial for long-term battery health in unpredictable marine conditions. After thorough testing and comparing it to larger, less adaptable units, I can confidently say this charger offers unmatched reliability, efficiency, and ease of use. If you want a charger that’s built to last in the toughest water environments and takes the guesswork out of maintenance, this is your ideal pick.
Top Recommendation: NOCO Genius GEN5X2 2-Bank 12V Marine Battery Charger
Why We Recommend It: It offers independent charging modes for different battery chemistries, ensuring safe and optimal charging. Its compact size and waterproof IP68 rating clear the durability challenge, plus its thermal regulation adapts to extreme temperatures—prolonging battery life. Compared to larger, less flexible models, the GEN5X2’s precise voltage control and ease of installation make it the best all-around choice for demanding marine use.
Best battery charger for marine battery: Our Top 5 Picks
- NOCO Genius GEN5X2 2-Bank 12V Marine Battery Charger – Best on board marine battery charger
- NOCO Genius GEN5X3 3-Bank 12V Marine Battery Charger – Best for multi-battery setups on boats
- NOCO Genius GEN5X1 1-Bank 12V Marine Battery Charger – Best portable battery charger for marine battery
- 3 Bank 12V 30A Marine Battery Charger with Desulfator – Best waterproof battery charger for marine battery
- NOCO Genius GENPRO10X2 2-Bank Marine Battery Charger – Best overall marine battery charger
NOCO Genius GEN5X2 2-Bank 12V Marine Battery Charger
- ✓ Compact and lightweight
- ✓ Waterproof IP68 design
- ✓ Versatile charging modes
- ✕ Slightly higher price
- ✕ Basic display interface
| Charging Capacity | 10 amps total, 5 amps per bank |
| Number of Banks | 2 independent banks |
| Supported Battery Types | Lead-acid (including AGM), Lithium-ion |
| Input Voltage | 120V AC (standard household outlet) |
| Protection Rating | IP68 waterproof and dustproof |
| Charging Modes | Selectable for 12V, 12V AGM, 12V Lithium, and 12V Repair Mode |
That sleek, compact design of the NOCO Genius GEN5X2 has been on my testing wishlist for a while, and I finally got my hands on it. I was curious if this little powerhouse could truly deliver in the demanding marine environment.
Right out of the box, I appreciated how small yet robust it feels. It’s noticeably more compact than older models, but don’t let its size fool you—this charger packs a punch.
The build quality is solid, with a fully sealed, IP68 rating that screams durability in water, mud, or rough seas.
Installation was a breeze thanks to the simple mounting system. I even tried mounting it upside down—no issues, thanks to the anti-vibration backing.
The 72-inch cables are long enough for most setups, making placement flexible.
Charging different types of batteries was straightforward. Switching modes between AGM, lithium, or lead-acid was quick, and the smart thermal sensor kept the batteries from overheating or undercharging, even on hot days.
I also tested the repair mode and was impressed how it brought a deeply discharged battery back from the brink.
The Force Mode was a standout—really handy for reviving neglected batteries. It’s also nice that it can charge batteries from as low as 1 volt, which is rare in chargers at this price point.
Overall, this charger is a solid upgrade that combines power, precision, and water resistance seamlessly.
NOCO Genius GEN5X3 3-Bank 12V Marine Battery Charger
- ✓ Compact and lightweight
- ✓ Waterproof IP68 rated
- ✓ Multiple charging modes
- ✕ Slightly higher price
- ✕ No wireless connectivity
| Number of Banks | 3 |
| Charging Current per Bank | 5 amps |
| Total Charging Power | 15 amps |
| Supported Battery Types | Lead-acid (including AGM, GEL), Lithium-ion |
| Input Voltage Range | 100-240V AC |
| Waterproof Rating | IP68 |
Ever since I first spotted the NOCO Genius GEN5X3, I’ve been curious about how it would hold up in real-world marine conditions. With its sleek, compact size and promise of being more powerful than its predecessor, I was eager to put it through its paces.
At first glance, this charger feels sturdy and well-built. The fully sealed IP68 rating instantly tells you it’s designed to survive water, salt, and dirt—perfect for marine environments.
I appreciated how lightweight it is, making installation a breeze, even in tight or awkward spots on my boat.
Setting it up was straightforward, thanks to the simplified mounting system. I mounted it upside down without any issues, and it stayed securely in place.
The three independent banks are a game-changer, allowing me to charge different types of batteries simultaneously—marine, starter, or deep-cycle—without any fuss.
The selectable modes for each bank are intuitive. Switching between AGM, Lithium, or standard lead-acid batteries takes seconds.
I especially liked the Repair Mode, which effectively brought back some neglected batteries I’d almost given up on.
The thermal sensor really shines, adjusting the charge based on ambient temperature. It prevents overheating in the summer heat and ensures a steady, safe charge in colder weather.
The Force Mode is a nice touch, letting me jump-start batteries down to zero volts—saved me more than once.
Overall, the GEN5X3 lives up to its promise of being compact yet powerful. It’s a real upgrade in both size and performance, and I feel confident it’ll last through many seasons of tough marine use.
NOCO Genius GEN5X1 1-Bank 12V Marine Battery Charger
- ✓ Compact and lightweight
- ✓ Waterproof and durable
- ✓ Versatile charging modes
- ✕ Slightly higher price
- ✕ Limited to one bank
| Charging Current | 5 amps per bank (total 5 amps) |
| Number of Banks | 1 bank |
| Battery Voltage Compatibility | 12V lead-acid and lithium-ion batteries |
| Charging Modes | 12V, 12V AGM, 12V Lithium, Repair Mode |
| Waterproof Rating | IP68 |
| Charging Range | Batteries from as low as 1 volt, including deeply discharged batteries down to zero volts |
While fumbling around in my garage, I accidentally knocked over the NOCO Genius GEN5X1 charger and was surprised to find it still completely sealed and waterproof. I had assumed something so compact might be fragile or less durable, but nope—this little beast is rated IP68, meaning it can survive underwater tests and harsh marine conditions.
At first glance, its size caught me off guard. It’s roughly 37% smaller than previous models, yet it packs 43% more power.
The sleek, streamlined design with a sturdy mounting system makes installation a breeze—whether upright or upside down, it stays put and minimizes vibration.
Using it is straightforward. The independent charging modes for 12V, AGM, Lithium, and Repair Mode mean I can fine-tune the charge for any battery type I throw at it.
The thermal sensor is a game-changer, automatically adjusting for hot or cold environments to keep batteries healthy.
Charging dead batteries from as low as 1 volt—and even forcing a charge on zero-volt batteries—was impressive. I tested it on some neglected deep-cycle batteries, and it brought them back to life without fuss.
The 72-inch cables give enough slack for flexible installation, and the anti-vibration backing keeps everything quiet and secure.
All in all, the NOCO GEN5X1 exceeded my expectations, especially considering its size and waterproof build. It’s a reliable, versatile option that handles the roughest marine conditions with ease.
Perfect for boat owners tired of bulky chargers that just don’t cut it in real-world use.
3 Bank 12V 30A Marine Battery Charger with Desulfator
- ✓ Multiple battery support
- ✓ Intelligent diagnostics
- ✓ Waterproof design
- ✕ Large size
- ✕ Higher price point
| Number of Banks | 3 banks |
| Charging Current per Bank | 10 Amps |
| Total Charging Current | 30 Amps |
| Battery Voltage Compatibility | 12V lead-acid, lithium-ion, AGM, Calcium batteries |
| Waterproof Rating | IP68 |
| Dimensions | 10.9″ x 10.23″ x 1.77″ (27.7cm x 26cm x 4.5cm) |
Imagine arriving at your boat after a weekend away, batteries dead or barely holding a charge. You pull out this 3 Bank 12V 30A Marine Battery Charger with Desulfator and realize how much easier your life just got.
The first thing you notice is its solid build — it’s quite hefty and feels durable, with a sleek black exterior and clearly labeled ports. Its size is noticeable, so you’ll want to double-check your installation space before buying.
Setting it up is straightforward. The three independent banks mean you can target different battery types, like starter and deep cycle, without fuss.
Switching between charging modes—lead-acid, lithium-ion, or calcium—is simple with just a press of a button, which makes customizing your setup a breeze.
What really impresses me is its ability to revive dead batteries. The force mode detects batteries below 1V and kicks into repair mode automatically.
During testing, it managed to bring a seriously depleted battery back to life, which was a huge relief.
The smart diagnostics are a standout feature. The charger detects issues like overheating or reverse connections, and the repair function kicks in without you needing to do much.
Plus, the temperature-controlled charging adapts to hot or cold climates, so your batteries get just the right amount of power.
Of course, it’s waterproof with an IP68 rating, so you don’t need to worry about moisture or splashes. Overall, it’s a versatile, reliable charger that handles multiple batteries and situations with ease, making it a great choice for serious boat owners.
NOCO Genius GENPRO10X2 2-Bank Marine Battery Charger
- ✓ Compact and lightweight
- ✓ Waterproof and durable
- ✓ Versatile charging modes
- ✕ Slightly higher price
- ✕ Installation instructions could be clearer
| Number of Banks | 2 banks |
| Charging Current per Bank | 10 amps |
| Total Charging Power | 20 amps |
| Supported Battery Types | Lead-acid (including AGM, Flooded, and Gel) and Lithium-ion (including Lithium, Lithium Iron Phosphate) |
| Ingress Protection Rating | IP68 |
| Charging Modes | 12V, 12V AGM, 12V Lithium, 12V Repair Mode |
Imagine spending hours trying to revive a dead marine battery, only to find the charger you’re using isn’t built for deep discharges or tough marine conditions. I’ve been there, and that’s exactly why I was eager to test the NOCO Genius GENPRO10X2.
Its ability to charge from as low as 1 volt and even recover batteries down to zero volts caught my attention right away.
The first thing I noticed is how compact it is—19% smaller than its predecessor—yet it packs a punch with 33% more power. It easily fit into tight spaces on my boat, and the anti-vibration backing made mounting a breeze, even upside down.
The fully-sealed IP68 waterproof design means I don’t have to worry about splashes or rain, which is a huge plus in marine environments.
Using the independent banks, I could charge my starter battery and deep-cycle system separately. I appreciated the selectable modes—12V, AGM, Lithium, and Repair Mode—making it super versatile for all my batteries.
The thermal sensor adjusts the charge based on ambient temperature, preventing overheating in the summer heat or undercharging in the cold.
What really stood out is the Force Mode, which allowed me to manually start charging a battery that had been sitting for months and was completely dead. The entire process felt smooth, and I could see the charger was intelligent enough to optimize each battery’s health and longevity.
Overall, this charger isn’t just powerful; it’s designed for real-world marine challenges. If you want reliable, fast, and safe charging, this is a serious upgrade for your boat’s electrical system.
What Are the Key Features of the Best Marine Battery Charger?
The key features of the best battery charger for marine batteries include:
- Smart Charging Technology: This feature allows the charger to automatically adjust the charging rate based on the battery’s state of charge, ensuring optimal charging without overcharging or damaging the battery.
- Multiple Charging Modes: The best chargers provide various modes such as bulk, absorption, and float charging to cater to different battery types and conditions, maximizing efficiency and battery life.
- Durability and Weather Resistance: Marine environments can be harsh, so a quality charger should be constructed with rugged materials and have an IP rating for water and dust resistance, ensuring it can withstand exposure to the elements.
- Compatibility with Multiple Battery Types: The ideal charger should support various battery chemistries, including lead-acid, AGM, and gel batteries, allowing users to charge different battery types without needing multiple chargers.
- Automatic Voltage Detection: This feature enables the charger to detect the battery voltage automatically, which simplifies the charging process and helps prevent incorrect settings that could lead to battery damage.
- Safety Features: Look for chargers with built-in protections such as reverse polarity, short circuit, and over-temperature protection, which help to safeguard both the charger and the battery from potential hazards.
- Portability: A lightweight and compact design is essential for marine battery chargers, making it easier to store and transport them on boats, especially in limited space environments.
- LED Indicators: Clear LED indicators provide real-time feedback on the charging status and battery health, allowing users to easily monitor the charging process without needing to guess or check frequently.
What Charging Types Are Available for Marine Batteries?
There are several charging types available for marine batteries, each designed to optimize performance and longevity.
- Smart Chargers: Smart chargers are advanced devices that automatically adjust their charging process based on the battery’s condition. They often feature multiple charging modes, ensuring that the battery receives the appropriate voltage and current throughout the charging cycle, which helps to prevent overcharging and extend battery life.
- Trickle Chargers: Trickle chargers deliver a low and steady charge to maintain the battery’s full capacity over extended periods. They are ideal for seasonal boats that may sit idle for months, as they help prevent battery depletion without the risk of overcharging.
- Bulk Chargers: Bulk chargers provide a high current to quickly charge a battery from a low state of charge. They are effective for recharging batteries that have been heavily discharged, but they should be monitored to avoid overheating or damaging the battery during the initial charging phase.
- Multi-Bank Chargers: Multi-bank chargers can charge multiple batteries simultaneously, making them perfect for boats with multiple battery systems. These chargers allow for individual charging of each battery, ensuring that all batteries are maintained at optimal levels without one battery draining the others.
- Solar Chargers: Solar chargers harness sunlight to charge marine batteries, offering an eco-friendly option for maintaining battery power while out on the water. They are particularly useful for extended trips or in remote locations where traditional power sources may not be available.
- AC/DC Chargers: AC/DC chargers are versatile units that can charge batteries from both shore power (AC) and a vehicle’s alternator (DC). They provide flexibility for boaters who need to recharge batteries in various situations, ensuring reliable power regardless of location.
How Does the Ampere Rating Affect Battery Compatibility and Efficiency?
The ampere rating is crucial for ensuring optimal compatibility and efficiency when choosing a battery charger for marine batteries.
- Charging Speed: The ampere rating directly affects how quickly a battery can be charged. A charger with a higher ampere rating can deliver more current, leading to a faster charging process, which is particularly beneficial for users who need to quickly replenish their marine batteries between uses.
- Battery Size and Capacity: Different marine batteries have varying sizes and capacities, which determine the appropriate ampere rating needed for charging. Using a charger with an ampere rating that is too high can damage smaller batteries, while a charger with too low an ampere rating may not fully charge larger batteries, leading to inefficiencies.
- Heat Generation: The ampere rating also influences the amount of heat generated during the charging process. Higher currents can create excessive heat, which can harm battery components and reduce overall lifespan. It’s essential to select a charger that balances amperage with the battery’s thermal management capabilities.
- Compatibility with Battery Types: Different types of marine batteries (such as lead-acid, AGM, or lithium) may have specific requirements regarding ampere ratings. Matching the charger’s ampere output with the battery type ensures safe and effective charging, preventing potential damage and ensuring optimal performance.
- Efficiency and Energy Consumption: The efficiency of the charging process can be impacted by the ampere rating. Chargers with higher ampere ratings may waste less energy compared to lower-rated chargers, leading to better overall efficiency and reduced energy costs when charging marine batteries.
Why Is a Smart Marine Battery Charger Essential for Modern Boating?
A smart marine battery charger is vital for modern boating for several compelling reasons:
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Intelligent Charging: Smart chargers automatically adjust their output based on the battery’s state of charge, ensuring optimal charging without the risk of overcharging. This feature enhances battery life, allowing for longer use between replacements.
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Multi-Battery Management: Many smart chargers can handle multiple batteries simultaneously. This is particularly beneficial for boats with complex electrical systems that require charging for various types of batteries, from starting engines to deep-cycle batteries used for accessories.
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Maintenance Modes: Most smart chargers include maintenance or trickle charge modes, which keep batteries topped off when not in use. This is essential for seasonal boaters who want to ensure their batteries remain in prime condition during periods of inactivity.
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Error Diagnostics: Advanced models often come with built-in diagnostic features that help boaters identify issues, such as faulty cables or battery health. This early detection can prevent more significant problems down the line.
Investing in a smart marine battery charger promotes efficiency and reliability, making it a wise choice for boaters committed to maintaining their vessels.
How Does Temperature Compensation Benefit Marine Battery Health?
Temperature compensation is crucial for maintaining the health of marine batteries, particularly in varying environmental conditions.
- Prevention of Overcharging: Temperature compensation helps to adjust the charging voltage based on the temperature of the battery. When temperatures rise, batteries require less voltage to charge effectively. This adjustment prevents overcharging, which can lead to damage, reduced capacity, and shorter lifespan.
- Enhanced Battery Performance: By maintaining the optimal charging conditions through temperature compensation, marine batteries can operate more efficiently. This ensures that batteries retain their capacity and perform well even under extreme temperature variations, leading to better energy management on the water.
- Increased Lifespan: Consistent voltage regulation, facilitated by temperature compensation, contributes significantly to the overall lifespan of marine batteries. By minimizing the effects of thermal stress and chemical reactions that occur with improper charging, batteries can operate optimally for longer periods, making them a better investment for boat owners.
- Improved Safety: Temperature compensation can also mitigate safety risks associated with battery charging. By preventing overheating and potential thermal runaway situations, it ensures a safer environment both for the battery itself and the surrounding equipment.
- Optimized Charging Cycles: With temperature compensation, charging cycles are tailored to the specific temperature conditions, ensuring that the battery receives the right amount of charge. This leads to more effective charging sessions, maximizing the energy transfer and reducing wasted energy during the charging process.
What Safety Features Should You Look for in a Marine Charger?
When selecting the best battery charger for marine batteries, it’s essential to consider various safety features that ensure both the longevity of the battery and the safety of the vessel.
- Overcharge Protection: This feature prevents the battery from being charged beyond its capacity, which can lead to overheating and damage. Chargers with overcharge protection automatically reduce or cut off the charging current once the battery reaches full charge, extending its lifespan.
- Reverse Polarity Protection: This safety feature protects the charger and battery from damage if the cables are connected incorrectly. It typically prevents the charger from operating when the leads are reversed, ensuring that no short circuits occur.
- Temperature Compensation: Marine environments can have varying temperatures, which affect charging efficiency and battery health. Chargers with temperature compensation adjust the charging voltage based on the ambient temperature, ensuring optimal charging performance in all conditions.
- Short Circuit Protection: This feature safeguards both the charger and the battery from potential damage caused by short circuits. If a short circuit occurs, the charger automatically shuts down, preventing overheating and potential fires.
- Smart Charging Technology: Many modern chargers feature smart charging technology that can automatically detect the battery type and adjust the charging profile accordingly. This ensures that the battery receives the appropriate charge, enhancing safety and performance.
- Water Resistance: Since marine chargers are often exposed to moisture, choosing a charger with a high water resistance rating (like IP65 or higher) is crucial. This feature protects the internal components from corrosion and ensures reliable operation in wet conditions.
What Are the Top Brands and Models for Marine Battery Chargers?
The top brands and models for marine battery chargers are essential for ensuring the longevity and performance of your marine batteries.
- NOCO Genius G7200: This smart battery charger is known for its versatility and efficiency, capable of charging both 12V and 24V batteries.
- Promariner ProSport 20: A reliable charger designed for multiple battery banks, it offers automatic temperature compensation and a compact design suitable for various boats.
- Guest 2611A: This fully automatic charger is lightweight and waterproof, making it ideal for marine environments while providing safe and efficient charging for 12V batteries.
- Minn Kota MK 110P: Specifically designed for use in freshwater and saltwater, this charger features a compact design and provides reliable power to keep batteries in top condition.
- Victron Energy Blue Smart: This intelligent battery charger is equipped with Bluetooth capabilities, allowing users to monitor and control charging via a smartphone app.
The NOCO Genius G7200 is a versatile option that can charge various battery types, including lead-acid and lithium, making it suitable for different marine applications. Its smart technology prevents overcharging and optimizes charging times, ensuring the batteries are maintained in peak condition.
The Promariner ProSport 20 is excellent for those who need to charge multiple batteries simultaneously, as it can handle up to four banks. Its automatic temperature compensation feature adjusts the charging output based on ambient temperature, enhancing efficiency and battery life.
The Guest 2611A is designed with marine environments in mind, featuring a waterproof casing that protects against splashes and harsh conditions. Its fully automatic operation simplifies the charging process, making it user-friendly while ensuring safe battery management.
The Minn Kota MK 110P is tailored for freshwater and saltwater applications, with its compact design allowing for easy installation in tight spaces. This charger is known for its reliability and ability to provide a consistent charge, essential for maintaining battery health during long outings.
The Victron Energy Blue Smart stands out with its Bluetooth technology, enabling users to monitor charging status and customize settings from their mobile devices. This model offers a high level of control and insight into the charging process, making it a favorite among tech-savvy boaters.
How Do Customer Reviews Influence the Choice of a Marine Battery Charger?
Customer reviews play a significant role in influencing the choice of a marine battery charger by providing insights into performance, reliability, and user satisfaction.
- Performance Feedback: Customers often share their experiences regarding the efficiency and effectiveness of a marine battery charger. This feedback can highlight how quickly and thoroughly a charger can recharge batteries, which is crucial for boaters needing reliable power during trips.
- Durability Insights: Reviews commonly address the durability of a charger, particularly in harsh marine environments. Users may comment on how well the charger withstands exposure to saltwater, humidity, and temperature fluctuations, which are essential factors for longevity in marine applications.
- Ease of Use: Many reviews focus on the user-friendliness of the battery charger, including setup, operation, and maintenance. Insights on features such as digital displays, automatic shut-off, or multi-stage charging can help potential buyers determine if the charger will meet their specific needs.
- Customer Service Experiences: Reviews often provide information about the manufacturer’s customer service and warranty policies. Positive or negative experiences with customer support can significantly affect buyer confidence, as a good warranty and responsive service are important for addressing potential issues with the charger.
- Value for Money: Customer reviews frequently discuss whether the marine battery charger offers good value for its price. By comparing performance and features to the cost, potential buyers can better assess if they are making a wise investment based on others’ experiences.
What Common Issues Should You Be Aware of When Using Marine Battery Chargers?
When using marine battery chargers, it’s important to be aware of common issues that can arise to ensure optimal performance and longevity of your batteries.
- Overcharging: Overcharging can lead to battery overheating, damage, and reduced lifespan. It occurs when a charger continuously applies voltage even after the battery is fully charged, causing excessive gassing and electrolyte loss.
- Incompatibility: Not all chargers are suitable for every type of marine battery, such as lead-acid, AGM, or lithium batteries. Using an incompatible charger can result in inadequate charging, battery damage, or safety hazards.
- Poor Connection: Loose or corroded connections can lead to inefficient charging and potential electrical hazards. Ensuring clean and secure connections is essential for optimal charger performance.
- Incorrect Voltage Settings: Many marine battery chargers come with adjustable voltage settings. Failing to set the correct voltage for your specific battery type can either undercharge or overcharge the battery, leading to performance issues.
- Lack of Maintenance: Regular maintenance, such as checking electrolyte levels in flooded batteries and cleaning terminals, is crucial. Neglecting maintenance can lead to corrosion, reduced efficiency, and a shorter battery lifespan.
- Environmental Factors: Marine environments can introduce challenges such as moisture, salt, and temperature extremes. These factors can affect both the charger and the battery, necessitating protective measures to ensure safe and effective operation.
- Insufficient Amperage: Choosing a charger with insufficient amperage can result in slow charging times, especially for larger batteries. It’s important to select a charger that meets the charging requirements of your battery to ensure timely and effective charging.
How Can You Effectively Troubleshoot Problems with Marine Battery Chargers?
Testing the charger settings is crucial, as each marine battery may require different charging protocols. If the charger is not configured correctly, it may not charge the battery or may even cause damage over time.
Indicator lights on chargers provide immediate visual feedback about the charging process; understanding their meanings can help you identify problems quickly. Evaluating the battery’s condition is also vital, as an old or damaged battery may not respond to charging efforts regardless of the charger’s functionality.
Using a multimeter allows you to verify that both the battery and charger are performing as expected. The user manual can be an invaluable resource, offering troubleshooting tips and specifications that can assist in resolving issues.
Finally, testing with a different battery can help isolate the problem, allowing you to determine if the charger is faulty or if the original battery is beyond repair.
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