/diy/ - Do It Yourself

i want to rebuild some old dewalt ni-cd 18v batteries with li-ion cells. to get the same voltage i will use a 5s configuration and will get the appropriate BMS. what i am not sure about is how do i charge this pack after i finish? can i use the old ni-cd 18v charger with only a positive an negative contact? why do dewalt and other brands li-ion systems have all those extra pins on the charger and battery? i thought a bms has a charge controller and balances your parallel groups so all you need to charge a custom pack is the right voltage charger.

i want to rebuild some old dewalt ni-cd 18v batteries with li-ion cells. to get the same voltage i will use a 5s configuration and will get the appropriate BMS. what i am not sure about is how do i charge this pack after i finish? can i use the old ni-cd 18v charger with only a positive an negative contact? why do dewalt and other brands li-ion systems have all those extra pins on the charger and battery? i thought a bms has a charge controller and balances your parallel groups so all you need to charge a custom pack is the right voltage charger.