If you've ever had a battery operated power tool long enough, you know that batteries typically wear out over time. While lithium-ion technology has limited that experience, it still happens. This guy swears that you can refurbish a battery yourself with a few conductors and a fresh battery. Things you should already have in the workshop.

Granted, I'll give you the fact that the old NiCad batteries this dude is using as an example are more simple and safe to work with, but you never know if this tip could work for your modern packs. Honestly, who still uses NiCad batteries? They're terrible, and just about every tool brand has an available lithium-ion conversion slug... You plug it into the tool, then plug a modern battery into it, everything works again because while the advertised voltages have changed over the years, they're all the same to an extent. That doesn't mean you can run a 12v tool on an 18v battery, but you can run a 20v tool on an 18v battery and vice versa no prob. But the question remains, if the lithium-ion batteries contain a chipset in the pack, how can you overcome the built in sunset without venting poisonous gases?

On second thought, you might not try this. Just keep your lithium batteries charged up. Don't leave them degrading in a dead state. They're made to keep and hold charges for a long period of time. You can also extend the life of them by popping them on the charger before they're dead. They don't have a life by number of recharges... It hangs more on the discharge count.