Cordless drills are powered by rechargeable batteries. Over time these batteries lose their ability to charge fully and maintain a charge. If your battery won't charge at all this is a simple way to get it to charge again.

Bring your cordless drill battery into the garage (if it's not there already).

Get a car battery charger or a fully charged car battery. You can use the battery that's in your car (you don't have to take it out).

If you are going to use the car battery charger be sure the two wires are not touching and plug it in. Touch the positive (red) to the positive (+) on the drill battery and touch the negative (black) to the negative (-) on the drill battery. Hold the charger on your battery for 5-10 seconds. This will give it enough of a boost to start charging again in your drill battery charger. If you don't have a car battery charger you can repeat the above steps using jumper cables from your car battery.