Even if you've never used jumper cables before, they're still an excellent way to get your car rolling again when you don't have a charger. Using jumper cables to revive a dead battery is a fairly ...

you should really invest in a charger that is capable of running some capacity tests against the cell. Or if you’re a bit more adventurous, you can build this “Battery Health Monitor ...

It is the unspoken law of cordless tools – eventually ... facing this dilemma with a Makita battery from a broken angle grinder and decided to make a USB charger out of it.