Unfortunately, after only two months shorter battery life as the old battery

I have the battery with the LG P920 Optimus 3D used. The Smartphone is now more than 2.5 years old, which is why I've decided to replace the battery. My original battery has no day survived partly even in the stand-bye more.

The first impression from the new battery was good. He looks like an original battery of LG and fits into the device. And finally, the smartphone has again survived even with active use for one day. Now after nearly two months of battery lasts noticeably worse and even below the level of the old batteries. Maybe I was just unlucky and had caught a defective battery, but could I do otherwise than to be reimbursed me the battery, which thanks to Amazon's goodwill itself over the Market Place was still possible.