at the beginning I had been looking forward: 4 hours Duration of my Dell Vostro. However, I had soon noticed that not really 4 hours lifetime were inside. The last hour goes according battery in Eildurchgang. Here the battery indicator at the top is still too optimistic and then in the end you end up at 3.5 hours. After a few months I had only half of the term. The first original Dell battery was the case only after 3 years. So: The battery looks initially great, then leaves but by very quickly - in every respect. Conclusion: If you buy cheap, buy twice. I'll be back to buy an original, even if it hurts briefly: the joy will then last longer.