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18650 Li-ion 3s battery pack with balance charger

How to build your own 18650 battery pack from scrapped laptop batteries, with built-in balance charger and protection circuit

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[work in progress]

  • 6 × 18650 Li-ion batteries Either you buy them or you get them from old laptop batteries
  • 3 × TP4056 charge control module 5V 1A straight from China
  • 1 × 3s 20 A BMS battery protection board Pick the current rating you need
  • 3 × 220 VAC to 5 VDC isolated switching converters Isolated is the key part
  • 1 × XT60 connector

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