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My PSR-350 is still OK.
Li-poly cells vary greatly in life due to quality (impurities, other defects), storage temperature (cool, not frozen is longest) and total number of virtual cycles ( 3 x 1/3rd discharge = 1 cycle), number of times fully discharged, time left fully charged or discharged (storage is best between 20% & 80% or maybe 30% and 70%), charge rate (fast charge is shorter life) and discharge rate.
The Sony PRS, unlike Kindles, have a real off mode, so the Kindle cells wear out quicker. They also have slow charge and if no front light (or WiFi mostly off, if included) so have low discharge.
The PRS range thus have long life cells compared to Kindles.
A cheap enough PRS-x50, PRS-T2 or PRS-T3 might be good value. Some PRS-T1 models have a bug were it freezes if you press on a word.
Older than PRS-x50 range might not have epub support and are more likely to have a worn out battery (Li-Poly cell).
The cell can be replaced on some older ereaders.
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