Any 12V battery will work. Lawn mower, car, boat, etc. You may have difficulty finding one to fit in the bag, however. You can connect the inverter to your car's battery without having to remove the battery from the car (just start the car periodically, or leave it running). The main thing to keep in mind is connectivity. Connecting to the car battery can be achieved via the jumper cable looking wires that were included with the VII. Other batteries may or may not connect with stock cables, so take them with you if you go looking for a battery. If you buy a battery to use on a regular basis, look for a deep cycle battery, and one that is over 11Ah, otherwise you risk damaging the battery.
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