Hi, I recieved my anger battery a few days back.. And I'm very happy with the performance..I'm getting around 30 hrs of battery backup on stock rom.. When using only calls and net browsing.. Not heavy apps..But I have faced only one problem,that when I use phones charger to charge the battery ,I get better battery life than when I charge it using external battery charger....other then this it's a very good battery...and I can use one battery while the other is charging....