ONLY from the specs:
the 1A is slower
all these feature statements are BS (not short for Battery Station
or apply to anything
Rapidly wake up the dormant batteries
Rapidly repair the logjam batteries
Rapidly dispel the fatigue caused by memory effect
Rapidly fill up the drain batteries
it would be very slow, and very Kind to your batteries, it might not be as usefull for major power batteries like 2500ma and up, because of speed.
i dont know if it has a TIMER shutoff, but if it did then it would be another issue (not problem) with higher capacity batteries.
the I2 thing would be much faster, and would be harder on low capacity batteries, mabey to hard (IMO), it should work best on any capacity beyond 2000ma depending on the open curcuit voltage when charging. if its open was say 5v or less it might be perfect for any capacity. if it hard hits at 500-300ma at the cutoff i would prefer not to use it on lower capacity cells.
i dont have EITHER, the price is GREAT, they are probably cheap, use them correctally and they probably are both ok.
Being a cheapskate myself, i too was looking at these, and think that the pair of them would work good for my different cell types.