When they're powered on, our I2's 'climb' up and down stairs pretty easily with little effort from the operator - My wife can do it without much trouble
The batteries don't care if you charge them right side up, laying on their side or upside down - No harm at all. They would probably prefer not to be charged in really hot (or really cold) temperatures. Warmer than 90 degrees or so would be about where I would get a bit concerned. If you're using them regularly I can see where you would prefer not to have to deal with the stairs and leave them outside - Sounds like a workable solution to me
Don
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