If I get a battery that was manufactured in China, I am first very critical. Basically, each battery, the i get is formed, that is, it is long loaded, unloaded and loaded to any capacity increase is obtained. For this I use a battery maintenance equipment professional of Conrad. After 3 days, I had the result and was amazed. The battery, indicated with 400 mAh 520 mAh reached. Better it is almost impossible. Fast delivery, best quality, 5 stars are fully deserved.