Quote:
Originally Posted by cybmole
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...
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That is exactly as one would expect. Both batteries will have lost capacity due to aging, as we have said (and the battery manufacturers and professionals will say too), and the battery you have been using will have also lost capacity through enduring discharge-charge cycles. So the in use battery would be expected to have less capacity than the stored one.
As Phil_C has said, the amount lost will depend on storage conditions. Even though the stored battery has been allowed to discharge completely, so not correct storage, its environment has been likely more stable than the battery that has been in use and so, all else being equal, will likely have lost less capacity due to aging than the in use battery.
So the stored battery will perform better than the battery that has been in use. BUT both batteries will have lost a significant amount of capacity from new due to aging.