Drill/ screwdriver battery rebuild (repair) to 18650 lithium ion batteries.

Parts:
Battery holder for 18650 size batteries - https://bit.ly/2Pl998O
3x Sony VTC4 18650 2100mAh 30A batteries
BMS to control charge/ discharge - https://bit.ly/2zMGWgB

Original charger can be used for charging.

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Converted old drill battery to lion 18650 elements. Decided to use battery holder for 3x 18650 elements to avoid spot welding of batteries. Added BMS to control charge/ discharge, so original charger cam be used for charging. Battery pack case was too small to fit battery holder with BMS, so front of case was cut off and then battery holder secured with electrical tape - not nicest solution but works well.