Sorry for posting this here but I did a search for battery, battery life, "battery life", battery+life and I get pages and pages of unrelated results.

Anyway, the battery life on my N810 (with latest software and updates) is very unstable during non-use. Sometimes after a recharging the battery status will display something like "When idle 7 days, When in use: 5 hours". Now sometimes the N810 live up to the stated status, BUT other times I will fully charge it in the morning, Make sure the wireless is off, lock the keys, but when I check it in the evening about 10 to 12 hours later. it is completely dead.

I don't think the battery is coming to the end of it's life cycle because I'll recharge the N810 and it'll last for 4 to 5 days. It'll be Ok for a few draining / recharge cycles, THEN without warning, AND seemingly with enough juice to last a few days, it'll be dead 10 hours later. AND THIS IS JUST WHEN IT'S IDLE! WTF