I assume this post deals with the original Galaxy TAB 10.1, but I'm having a similar issue with the Galaxy TAB 2 10.1. I've had my Galaxy TAB 2 for about two months now. Everything has worked flawlessly. Two days ago, I allowed a sizable (268MB) update to process. Since the tablet shipped with Android 4.0 (Ice Cream Sandwich), this was at best an incremental update from 4.0.3 to 4.0.4. After the update, there were minor changes in the behavior of the OS (sound, imagery, etc). One of most noticeable issues was a huge drain on the battery from the "Android OS" listing in "Settings/Battery". I experienced a similar issue on my Galaxy Nexus after a similar update, but it eventually corrected itself. While the percentage of battery use has come down (from 55% to 16% at last check), NOW there is this RED "X" issue on the battery that I cannot seem to get around. I've rebooted, adjusted power-saving settings, etc - all to no avail. Like the original author of this thread, I seem unable to get the Galaxy TAB 2 to charge regardless of connection type or power source. And YES, I am using the appropriate OEM-supplied adapters/cables, but truth be told, I've never had an issue using other cables, including a USB extension cable. The battery ALWAYS charged. More commonly, I find that charging from one of my Mac's USB outlets is more challenging because of the lower output, but this has been common to the Nexus as well. For now, I'm going to point my finger at the 4.0.4 update with the hopes that Samsung catches wind of this soon and comes up with a fix. The other solution for me will be to root the device and flash stock 4.0.3 or a custom ROM on to the device. [UPDATED 07/16/2012 7:38AM] Just checked tablet, it seems to have trickle-charged overnight to 90%, but the RED "X" is still present even when plugged into a wall outlet in another room at my home. Also the battery reports a state of "DISCHARGING" with a value over 2 DAYS even while plugged in. Checked for update, none available.