I have the M12 PVC ABS shears (use them in tight places like pumps in manholes) and the Pex expander and the copper tubing cutters. Anyway I have the regular batteries that came with them and bought the double duty expanded battery it has longer power and acts as a nice little stand for the tool. The problem is the double battery only works in the copper cutters and the pex expander, just flashes the lights once when I hit the trigger, yet works in everything else and the standard batteries run all of them. No big but I wanted the extra battery life for doing 2" PVC cuts. I have not done any research on this yet but just an FYI to anyone considering buying this bigger battery.