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The H2O is not all that easy to open and then close. There are teardowns available online.
If the H2O has been sitting around for long enough with a flat battery, then there could be a problem with the battery or noticeable shortened time between charges.
My H2O battery is good. But I've never let it sit around flat or low enough. I use it often enough that I'm able to know when it's needing to be charged. Plus if I wasn't going to be using it for long enough, I would turn it off.
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