Please meet the electronics inside a Li-ion laptop battery pack! There are two boards. Larger one has the smart charger IC (bq2060), five status LEDs, MOSFETs for charge control and other discrete components.
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| Smart charger circuitry. |
The smaller connector board has 5 lines, out of which I could identify 4 and use 2: positive and negative battery pack leads, that are bidirectional (charge and discharge current flows there). Electronics on this board looks like a level converter for serial communication between the computer and the pack.
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| Connector board. |
This setup works perfectly even without the small board, thus connecting directly to red/black thick wires between the two PCBs. I don't need the connector, nor the data communication feature: I want to recharge the pack and use its energy.
