If you have a multimeter but no diagram:
A: No. 40V packs use 10 cells in series (10S) and have a different pin arrangement. Hart 20v Battery Pinout Diagram
The Hart 20V battery pack typically uses three main electrical contacts: If you have a multimeter but no diagram: A: No
Some packs also include additional alignment tabs or plastic shrouds for mechanical fit; only the metal contacts carry electrical signals. Some packs also include additional alignment tabs or
Lithium-Ion batteries are sensitive to heat. Inside the battery pack, a small thermistor (usually a 10k NTC resistor) is taped to the battery cells.