Sorry for bringing an old thread back up but I was just wondering how safe battery tenders are? I read their manual and it mentioned that it needs to be in a well ventilated area or there could be an explosion. I believe that my garage has some ventilation but I'm not sure how much I would need. There are no windows or anything in the garage to ventilate.
So my dilemma here is if a battery tender is worth the risk or should I just disconnect the negative battery terminal? Also, what was it that you weren't supposed to do with the windows when the battery is disconnected? It was something about the windows not rolling back up and it could damage the door frame.
Thanks.
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