Monday Battery? - No buy recommendation

I bought this battery because of the many positive reviews. Delivery carried out by Amazon in the usual speed. Upon receipt of the batteries I have him. Immediately in my Acer for testing Everything seemed ok, the battery was charged at 90%, the laptop ran. Unfortunately, only 5 minutes, then suddenly went the laptop easy. At first I thought it is the state of charge. So connected power supply and - nothing, nothing happened, there was no charge. Only after repeated removal and reinsertion of the battery charging began. But even after the full charge over again the same game. The Acer was always after 5 -allerhöchstens seven minutes simply - no normal shutdown, but like when you pull the plug on the PC, and also with all the consequences arising therefrom. There was no defect in the Acer before, because with the old battery he ran until the battery is weak and then but drove properly all programs down. With the power supply unit he ran smoothly for several hours. The unwinding went smoothly and quickly. After this experience, I bought me an original battery, while being issued for 13 more, but now everything runs smoothly.