POWERBANK 32140 22.5W LiFePO₄ • 30Ah
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Description
LiFePO₄ Power Bank 22.5W
Compact power bank based on two 32140 LiFePO₄ cells. The cells are connected in parallel, giving a total capacity of 30Ah at a nominal voltage of 3.2V.
Required Components
- 22.5W Power Bank Module 3.2V LFP (LX-TL225P)
- 32140 LiFePO₄ 15Ah cells — 2 pcs
- 40 kΩ resistor for charge indicator calibration
- Thin wires, about 5 cm long, for relocating the charge indicator
- Power wires for battery connection
- M3×40 screws — 2 pcs
- Heatsink 40×20×11 mm
I used a 40×40×11 mm LED heatsink and cut it in half.
Board Modification
To fit the board into this project, the charge indicator must be relocated:
- Desolder the charge indicator display from the board.
- Reconnect it using thin wires about 5 cm long.
- Replace the R6 resistor group with a 40 kΩ equivalent resistor.
This calibrates the charge indicator for a 30Ah battery pack made from two 32140 15Ah cells connected in parallel.
Battery Connection
Connect the two cells in parallel:
- positive to positive
- negative to negative
Connect the battery pack to the board:
- B+ → battery pack positive
- B− → battery pack negative
After Assembly
It is recommended to perform 1–2 full charge/discharge cycles to help calibrate the capacity indicator. After that, the charge level readings should become more accurate.
License
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