We have two I2's which we've owned now for 2 years plus. I keep them indoors all the time. I plug them in one at a time, once a month and it takes between 30 and 45 minutes for both batteries to start blinking green
In my opinion, one hour every week would be a very conservative schedule - Anything more isn't really needed, IMO . . . . despite what many people say
I also have 3 spare batteries that I've been 'experimenting' with. They are stored indoors, not on a machine and I check their voltages from time to time - They never change. I used to put them on a machine every 3 or 4 months to charge, but the recharge took only minutes, so I cut that back to every 6 or 8 months with the same result. I do check the voltages more often, just to make sure. Batteries not on a machine discharge VERY slowly
As always, go with whatever makes you comfortable - The above is just my personal experience
Don
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