The whole kit was mounted on a hand truck for portability, and [Glenn] says that the charger/generator only needs to run about 5 minutes before a dead battery has enough juice to crank an engine.

Rather than mess around with inverters or generators, he can simply use a DC-to-DC battery charger and his huge custom ... to swap the batteries for you, a DIY pack like this might be the easiest ...

Versatile and powerful battery charger supporting multiple voltages and battery types-ideal for automotive, marine, and ...