/diy/ - Do It Yourself

>>433446

Depends entirely on what it is. Most car batteries have a capacity of at least a few hundred watt-hours and could easily charge a few phones without being recharged by the alternator, but you're risking damaging the battery at little by powering something drawing more than a dozen watts or so for that long.

You have to remember, the design philosophy behind a car battery is totally different than most electrochemical devices. Most batteries try and strike some sort of balance between energy density, power density, and cycle life. Car batteries are made to dump as many amps as they can and that's about it.

>>433450

Women are overrated.