I think I'm in the same situation.
My Kobo Clara HD has stopped working (only the LED light switches on when I plug it to a power source, but nothing happens to the screen besides flashing with black and white 2 or 3 times).
I think it might have been due a battery failure (since I just left my Kobo for some months without being charged).
Please let me know if you made the Kobo Aura Glo HD H2O battery work with the Kobo Clara HD. I would be grateful
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