Working in construction most of my life,I've found that if you don't drain the battery totally they run down easier and do not last as long. Once they go dead they are pretty much toast. That goes for Milkawkee,PorterCable, Bosch, all great products. From my view it's easier/cheaper to find a new one complete with two batteries and move on. I have lots ot 9.6 and up taking up space in the garage. One of my favorites was the 9.6 Bosch. Comfortable and balanced. Most of the 18/24 volts are heavy on the battery end battery end from my view.
Dan
