I charged my battery yesterday. WiFi is off ( I always turn it off when not using) until got a green light. This morning when I went to use it and battery warning said it was at 2%.
My battery never goes down much when in sleep mode. Any ideas what's wrong?
There are a few things you need to check:
One of the workaround is to charge the battery up to 100%. If issue persists, call for battery replacement.
Check if you had a ton of stuff running in the background (and probably not even then, since you had wifi turned off). The first thing to check is the setting that tells you what's been using your battery. Go to Settings > About Tablet > Battery Usage. At least it should give you some idea what the culprit might be, unless it's a hardware issue.
Make sure you really shut the machine down. Sometimes it turns off the screen before actually press the second shut down message. Best way to check is after power down, tap the on/off key. If the shut down warning is on the screen, tap it to shut it off completely, and the A1 will power down.