At first I noticed the backlight sometimes flickered. Then a few times when I slid out the keyboard it didn't come on, but...

I bought one of these - it took over a month to arrive but it appears to work well and is much higher capacity than the original. http://www.ebay.com/itm/New-Portable-Replacement-Battery-for-Motorola-EB41-XT894-XT898-2850mah-Golden-/401138426325?hash=item5d65b6a1d5:g:DTkA... Note that mine arrived with a small Philips head screwdriver, but you actually need a torx driver. Luckily I had one on hand from previous phone disassemblies...