Good question. I use cells of the same lifepo4 chemistr as segway inc, which is a very stable cell that doesn't allow thermal runaway, or the fires you're referring to. So there is no lapse in safety, this is very important to me. The cycle life if also 2500 times, so they are good for the long haul. There are cells of higher capacity by far, but the chemistry changes and they wouldn't be as safe. Send me a message if you have any other questions!
Steve
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