This thing works great for an old pickup that I drive about 2 times a month. I connected it to the battery with the clamps that came with it and left the solar panel under the windshield washer it sits there in a downpour, a strong wind. If it wasn't plugged in the battery would have died in 2 weeks and I would have had to run it from an external source. There is no more of it. The battery might be dead completely, but after a few days of decent sun the battery works again and I can just use it whenever I want. No connection cables or extension cables for the battery tender. Just park the truck somewhere and reconnect the cables. Even the suction cups don't fit. They just don't stick to anything, so I just put the plate under the windshield to keep it from flying off.
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