So yesterday I reverted to FW 2.8.1b, charged both Aura HDs to 100%, and let them sit overnight. Lo and behold, they are both at 100% charge today. With FW 3.1.0 and 3.1.1, one of them would lose approximately 25% of its charge overnight. So there is definitely something going on with FW 3.1.0 and 3.1.1 that causes some Kobos to discharge their batteries, but I don't have a clue what could cause that kind of random problem. I tried removing the SD card, disallowing automatic sleep and wake functions, logging out to generate a new database... I give up. I hope Kobo finds it, because 2.8.1b has its own issues, but it's better than needing to recharge every two or three days.
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