As time moves we find that our drill don't cut it any more as now there are all of these new powerful cordless drills with lithium but the price of one of them cost about an arm or leg so what do you do?
Convert them to lithium,
Motor technology has been the same since 20 years ago and it's still the same in all new drills "DC Brushed Motors"
Up on opening my "Old" drill and having a look at my motor my motor looked very new and the brushes ware far from worn if not still would go strong for many years to come.
On the other end the battery's ware totally on the end of its life.
Step 1: Opening Your Battery Pack
When you open your battery pack your going to find sets of sub c battery's which are most Likely cheap cells depending on your make of your drill since we only care about the enclosure you can throw away the cells or keep them for a different project doesn't matter what we need to know is the inside dimensions as that will tell us how big the battery can be.
Order a smaller battery then the dimension as it will allow you to move the battery around.