I use a small car battery, i think its 45A. Powers my charger, tyre warmers and enough power for 2/3 meetings before it needs recharge. You can also buy a power inverter to convert the 12v supply from a cigarette lighter in the car to a mains outlet, your standard 240v ac 3 pin plug. You could then use your charger but to be honest id use a small car battery and buy a charger like the one above
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