keep cycleing it
i had a bunch of 2/3 a cells that i never used from all battery.com so i made a pack out of em
they are rated for 1300, when i started cycling they were at 500. about 10 cycles later now they are at 1301.
so cycle it a little and see how it holds out.
if it slowly increases keep going at it.
i found charging and discharging at .4 ma works well