The original batteries were PSR12 my order, and unloaded all alone, NI-CD, NI-MH with the latter technology, the drill has found a facelift. Yes it is heavier, but require 3000mAh !!! It perfectly integrates with the drill and case the charger is compatible. The delivery was extremely fast (controlled 16 received 18 !!!) and neat! It's all good. To see in the time ..... Thanks About Batteries.