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One way to Rebuild Laptop Battery

10.8V 4.4Ah Laptop Battery

Sanyo NCR18650GA 3.6V 3350mAh 10A

Sanyo NCR18650GA internal resistance 25-26mΩ

Charge in parallel to 4.1V

Measuring battery capacity

4.1V 39999mAh started

Reading discharge data

39999mAh – 37142mAh = 2857mAh

Charge in parallel again

Battery waiting to be assembled

Available battery capacity: 547mAh

Remove the battery cover 1

Remove the battery cover 2

Remove the battery cover 3

Inside the battery

Glass glue fixed new battery

Disconnect wires in strict order, This way the BMS is not locked

New battery completes welding

Replacement completed

Battery gauge reset

Battery parameters before reset

Battery parameters after reset

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