12 V Drill battery pack alternative
This one from my son, who found the idea on another board
When the 12 V battery pack dies and will not hold a charge for your 12 V cordless tools try this:
(AND Yes, I did a search on here, but did not find anything like this)
Take the dead battery pack apart and toss the cells.
Take an extension cord and remove BOTH ends (male & female) from the cord
Solder the extension cord wires to the contacts INSIDE the battery pack.
Drill a hole in the base of the pack and run the extension cord through the hole.
Get a pair of battery-charger alligator clamps and attach them to the other end of the cord.
IMPORTANT: Be sure you put the red clip on the wire that is connected to the + terminal inside the old battery pack and the black clip on the (-) terminal wire.
Now, whenever you are working on your car, your 12V drill/sander etc, etc has a power supply, by simply attaching the clips to your car battery. Especially good for "on the road" repairs, etc,
You don't have to worry about the battery pack going dead, or the lack of a 120V outlet on the road
Yes, you lose the "cordless" feature, but you gain a reliable tool to take along on a trip!
(and you can still use the drill as a cordless by putting your other 12 V (working) battery pack in it for "around the house" work)