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My Clara has exhibited similar behavior for the last six months. (It is 30 months old.) It seems OK until the charge gets down to about 30%. The next day it will be dead.
I know that the profile of Li-Ion batteries is to maintain good power for a long time, then drop off rapidly at the end. But this is different. And disappointing. My old Sony Readers were still going strong after 7 or 8 years. Sure, the charge didn't last as long as when new, but they didn't act like this.
For reference, a charge will now last me about 3 weeks. This roughly translates to 30-40 hours of reading. It's hard to pin down because the reader will at times be charging while connected to calibre.
It's a shock to have 30% charge when I go to sleep and find the thing dead the next day. This does not seem to bode well for longevity.
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