I have been using this phone for almost 1 and half years, with the same old battery.
No major problems at all. Just could not move app to sd card with the low internal memory so could not install too much apps .
But it worth the price. fell off manytimes but x cracked. Notice that it lags because the memory nearly full. So need to clear up for same space. If you want large internal memory then go for higher price phone.