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I never thought of a bike tube! I have the same gen setup right now. It gets hot after about 2hrs. I have been keeping it around 10amps. Didn't you have to work to get a tube over the cell? Did you cut the tube or use it whole? I tried splice tape, liquid tape, and I have seen what tool dip does. I almost broke down and ordered shrink tubing. I'll go try the bike tube. Thanks!
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Got the tube at Wally World. Cut the valve stem section out. It was nice & square once laid out flat. I then cut it long ways & it's full of a white powder. Washed it in warn soapy water & then wraped the cell. Worked great.