I dont know if this will help but I have a tp on the regular cm9 alpha 2. I have drained the battery before and charged it back up without a problem but last night it died and I left it on the charger, the battery charging picture showed up so I thought it was good. The next day I checked it and it was dead. So i tried it again and checked it a few minutes later. It booted to cm9 but the charge stayed at 0%. I left it for a few hours and it was dead again when checked it. So this time i waited so I can boot it to webos. On webos the charging went up to 2% in about one minute and is steadily charging. So i think it does have something to do with cm9. On a side note the oem usb cable is crap, It only works on certain positions.