Many chargers double as maintainers, but you don't need many amps just to keep a battery topped up. Photo credit: David Traver Adolphus / AutoGuide.com. A charged battery is a happy battery.

So not only will the MH-CD42 charge your lithium-ion cells when given a nominal USB input voltage (4.5 – 5 VDC), it will also provide essential protections for the battery. That means looking ...

But if these batteries are rechargeable, you need a charger. That’s where [Jon]’s entry for the Hackaday Prize comes in handy. It’s a small, cheap charger for LIR2032 and other rechargeable ...

Make dead batteries a thing of the past with these reliable and durable trickle chargers. When it comes to choosing a reliable and high-quality trickle charger, the options are vast and varied.

We earn commissions from purchases you make using links in our articles. Learn more. A car battery charger will make sure you can start your car if you're not using for a while. If you’re going ...

That’s why it’s handy to have an external car battery charger to ensure your engine is ready to go when you are. A charger can also help to extend the life of your battery, for instance ...