These are powerful batteries to replace my dead/weakened original B&D VersaPak batteries. I was able to grind the rust off the bottom quarter panel lip of our SUV on one charge with plenty of power to spare. Appears to be compatible with the original B&D charger. The fit is tight but not unmanageable. In fact, the tight fit allows you to pop the batteries slightly out of the charger gto prevent any charge leakage. I took some measurements that will explain why these have such a tight fit in the original B&D charger and Wizard and posted them here. Battery life for the job was excellent. Long term battery life and reliability remain to be seen.
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