[Eggmont] was facing this dilemma with a Makita battery from a broken angle grinder and decided to make a USB charger out of it ... old cigarette lighter-to-USB adapter. First, [Eggmont] removed ...

If you’re going to be regularly charging more than one device at a time, buy an adapter with at least two ports—some have as many as four ports. You can even get a mix of USB-C and USB-A ...