But if you are having charging issues in your vehicle (dead alternator or whatever) then it won't charge in there, since it's probably why you have to use it to begin with.

I used it very often, even when a vehicle that have a dead battery and a bad alternator I have used it as a power source

One example of when I used my pack, my parent's Ford Freestyle had the alternator fail a couple years back.

I have a gb40 that’s worked as

Already usd it to jump start my daughters car after the battery was fully drained as she left the lights on overnight

Slow as can be to charge, does not actually come with a charger, that's extra

After the initial charging when it arrived which took longer than I expected it works as it should, getting a few more (the GB40) for the other vehicles just to have them.

This thing...battery was below 6 volts, less than half, and cranked up as strong as if it were a brand new battery

n’t be sad.

Jump box works great fingers crossed it does t fail like many of us had

I have a gb40 that’s worked as

Already usd it to jump start my daughters car after the battery was fully drained as she left the lights on overnight

Slow as can be to charge, does not actually come with a charger, that's extra

After the initial charging when it arrived which took longer than I expected it works as it should, getting a few more (the GB40) for the other vehicles just to have them.

This thing...battery was below 6 volts, less than half, and cranked up as strong as if it were a brand new battery

n’t be sad.

Jump box works great fingers crossed it does t fail like many of us had