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Originally Posted by bitterdave
We've got a 99 Boxter that we don't drive too often (side effect of having small children). I'd like to get a trickle charger for it.
Porsche makes some pretty expensive ones and I'm trying to figure out what the minimum specs should be and/or recommended brands/models. 12V? 0.75A or 1.25A? Also, for that model year, would the cigarette lighter adapter work, or do I need to connect directly to the battery? Any recommendations would be appreciated!
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Don't buy a trickle charger, don't ask for a trickle charger, don't even think about a trickle charger. They keep feeding current to the battery all the time and eventually ruin it.
You need to buy a battery maintainer. These devices sense when the battery is no longer accepting a charge and turn off until the battery needs more charge. There's nothing special about the Porsche that requires a different maintainer than any other car. Just get a high quality one so that it will work as intended and you will be fine.
I've used battery tender jr's on several cars and have been satisfied.