Regarding the storage issue,
Lipos will not self-discharge anywhere near as much as NiMH. The actual breed of NiMH DO NOT like being kept at any point in time under 0.9V/cel, and will usually totally self discharge within a couple of weeks, meaning that you'll need to put some charge in them every so often if you're not racing, otherwise you'l be left with cells that are useless.
Lipo do not suffer from this problem anywhere near as much as their self discharge rate is very very low. Of course it is better to keep an eye on them, but once a month will be well enough.
They do not like low temperatures however so make sure you keep them out of frost's way.
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