All you need is a constant source of charged batteries. There are chargers out there that will charge the batteries right off your 12 volt car bat. This would work for you hot shot type chargers.

You could always buy small 12 volt batteries and use them til there spent and then get a new one. You could always do what I do and buy a motorcycle battery & order a starter with the wire leads and put clips on the end. That would give you tons of starts before it would need charging again, and you could always charge it up quick with a car & jumper cables if needed.