I have an 18v 2000mAh black and decker drill battery that I want to charge and use in the mean time while I wait for a proper charger to arrive.
I have a DROK Voltage Regulator/Buck converter (https://www.amazon.com/gp/product/B078Q1624B) that has a constant current mode and from what I understand should be sufficient in charging it but I wanted to confirm.
From what I've figured the charging voltage should be around 21v and the charging current should be Current/10 so 400mA constant charging current although the official charger states to output 500mA.
So with the Regulator set to output 21v and 400mA in constant current mode, this should charge the battery just fine without risk of overcharging or damaging the battery right?
If there is anything I'm misunderstanding or missing please let me know, thank you ;)