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Figured I'd ask the braintrust here about any experience with Antigravity lithium batteries. For a number of reasons I wasn't able to get the Porsche out at all over the winter here, and the battery's dead. I've read some good things about their capacity to hold a reserve so they start after a little while - I'm not expecting 4 months, but the car's not gonna get a ton of use beyond once or twice a month this summer.
Unfortunately the apartment building we live in has absolutely no electrical outlets in the garage, so a trickle charger is not an option. So aside from an expensive lithium battery, does anyone have any experience in a similar situation?
Does it have lights or a window? I've used a solar panel charger over a couple of winters on motorcycles with good luck. The NOCO brand one I have puts out 12 volts from a streetlight.