Is always so ne thing with the original promise of batteries. The price differences are already fierce. Did it anyway with this battery, tried for my Samsung S3 Mini and am pleasantly surprised for now. Smartphon running 2-3 days depending on use. For load testing, I'm not the type (ie hours: minutes: seconds, with / without talks etc.) All I know is that my old battery was Alike after a day at the end and not evenly, but from 50 to 0 in minutes , This battery here behaves completely uniform. For the price you can not go wrong. However, he should at least a period of six. I will report.