did you pay cash ?
if you used paypal, you can open a dispute with them.
there should be folks here ( but no me) who can advise on the practicalities of replacing a battery, if that is needed
with no books , no (or minimal) light and no wifi there's really nothing for the clara to be doing that would burn up battery power, so it should discharge very slowly and take a long time zero.
clock does go haywire if battery gets completely drained, I had an older kobo that reverted to 2013 when flat.
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