Solar trickle chargers
Discussion
Baldchap said:
Only anecdotal, but we had a people carrier that rarely got used and would often have starting trouble and flat battery, so I got an AA branded one off Amazon that plugs into the OBD port and it never had a problem from that day on. 
That’s a great idea, I’d only ever seen the cigarette lighter ones and they obviously require a permanent live to work when the ignition is off which can be a faff. 
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