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If your drill is old and has had a lot of use, it may be that the battery has had a full life and just needs to be replaced. Batteries will only take so many charges and then will quit holding a charge.
If the battery is one year old, it is shot. I have about 20 batteries under the bench and about 5 cordless drills , saws, lights, you name it , I won't buy anymore. I have a bunch of them, the batteries don't last. It is cheaper to buy a new kit with new batteries than to replace the batteries. No more.
One thing I,ve found with cordless tool batteries is that if they're completely dead, the charger won't recognize them. Try hooking a known good battery with a charge up to the problem battery, terminal for terminal, with small jumpers. Leave it hooked up for a minute, maybe a minute and a half. this should be sufficient to provide just enough charge to bring the battery up to the "threshold level" required for the charger to recognize it. Then, simply charge the battery in the normal way. If this doesn't work, you may need new batteries, or a new charger. Hope this helps you.
You may want to try a different charger base. Any way you can borrow one so you don't have to purchase first? If for some reason the charger isn't working well, you may be getting a partial charge and only that.
You may even want to rent a cordless just to try charging your own battery on a different base. before you buy.
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.