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Back in 1989 I hired a camcorder for a road trip. It came with two nicad batteries that only lasted 20 minutes each from a two hour charge. While we were on the road, to charge them, we connected them directly to the 12V supply coming out of the cigarette lighter with a butchered cigarette lighter adapter we had. After just 20 minutes of charging, they'd give us 30 minutes of usage. If anything, they worked better after a few days of this. I didn't tell VisionHire what we did.