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BatteryJack inc.
BatteryJack inc. 12V 25W 3A LiFePO4 Battery Charger Maintainer 14.4V 4S
Charges and maintains 12.8 V LiFePO4 packs from 3 to 30 Ah at 14.4 V and 3 A with short-circuit and reverse-polarity protection
- Battery TypeLi-ion
- Charges 12.8 V LiFePO4 packs at 14.4 V 3 A
- Maintains 3–30 Ah batteries with automatic shut-off
- Built-in short-circuit and reverse-polarity protection
- CE and UL safety approvals included
- Universal 100–240 V 50/60 Hz input for worldwide use
12 V 25 W LiFePO4 Charger Maintainer
This charger is built for 12.8 V four-cell lithium iron phosphate packs from 3 Ah to 30 Ah. It suits motorcycle owners, hobbyists and backup-power users who need a simple plug-and-go solution. The unit is not for sealed lead-acid or other chemistries, so buyers who want a universal charger should look elsewhere.
Capacity and headroom
The 3 A output delivers 25 W, comfortably replenishing packs up to 30 Ah in a few hours. Below 3 Ah the current may be too high for very small cells, and above 30 Ah charge times become impractically long. The 14.4 V nominal finish voltage matches standard 4S LiFePO4 BMS limits.
Thermals noise and power draw
The supply accepts 100–240 V AC at 50/60 Hz and runs silently with no fan. In normal use it draws only the power needed for the 1.5 A DC stage, staying cool to the touch. Built-in short-circuit and reverse-polarity protection prevent fault currents without adding audible noise.
Highlights
- Charges 12.8 V LiFePO4 packs at 14.4 V 3 A
- Maintains 3–30 Ah batteries with automatic shut-off
- Built-in short-circuit and reverse-polarity protection
- CE and UL safety approvals included
- Universal 100–240 V 50/60 Hz input for worldwide use
Specifications
| Battery Type | Li-ion |
|---|
Questions about this item
Will the 14.6 V output and 3 A current work safely with my existing 12.8 V 4S LiFePO4 battery that has a built-in BMS?
Yes, the charger delivers 14.6 V at up to 3 A and is designed for 12.8 V 4S packs from 3 Ah to 30 Ah that include their own BMS, so it will charge and maintain your battery without overcharging.
How do I know the charger is operating correctly once I connect the alligator clips?
The indicator lamp shows red while charging and turns green when the battery reaches full charge, confirming normal operation.
Does the package include both the AC power cord and the alligator-clip leads, or do I need to buy any cables separately?
The unit comes with a dual alligator-clip connector (red for positive, black for negative) and accepts 100–240 V AC input, so no extra cables are required for standard use.
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