right if you get a leisure battery you will have to keep charging it up . im assuming your cool box has the cigarette lighter adaptor on the end of the lead.what you need to keep this battery topped up is the same socket as the one you have on tthe end of the cool box lead. on the end of this lead (which the wires can split in two you need to get two crocodile clips attatched one to each wire.( you must make sure which is live and earth. when you charge the battery up you plug the socket into the lighter socket and thus connect it to the battery whilst you are on the move. im sorry i dont know the name of them but if you can explain this to some one with a bit of electrical knolwledge im sure they would be able to make you one. the parts dont cost much
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