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If your warranty has expired, you're best off buying a new drill. Replacing batteries will quickly add up to the cost of a new drill.
I know they cost a lot more, but, if you want something that will last a lot longer, look at a Milwaukee, DeWalt, Makita, Bosch, Hitachi for your replacement. Milwaukee actually guarantees their LiIon batteries will last 1,000 charges or longer.
This may not be as easy as you think. The first one my have trouble with the trigger switch, but it could be the motor. Without checking continuity, or replacing them individually you will not be able to tell which one is bad.
Another problem could be the brushes. That is what is most likely wrong with the 2nd one. Remove the 2 black screw caps on the rear of the drill, and remove the carbon brushes. Do they look worn? If so they will need to be replaced. If this is the case the motor may be breaking down, and wearing the brushes down too fast.
The good news is that Milwaukee Tools, offer a 5 year limited warranty, If you have a receipt, or can read the serial number. Take it in, or mail it to a service center. They will take care of it for you if they are less then 5 years old.