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ok - with my spare 650 I bought it new, charged & tested it, put it back in the box, left it there for 2+ years. ( in a bedroom cupboard)
took it out last week - it was completely flat by then as you'd expect - & I only did a couple of days re-testing but after a wall charge followed by ~48 hours of standby + say 2-300 pages of reading it was only down 1 bar. the unit I'd used daily for 2 -3 years was going down a tad faster than that.
t3 is advertised with 2 month battery charge whereas 650 was sold as 2 weeks per charge, so you should be fine to buy a spare & stash it. You could even take it out of storage after 11 1/2 months, test it & if not happy then get a new one before the guarantee expired !
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