Green Cell® Standard Series BTP-B4K8 BTP-B7K8 Battery for Fujitsu-Siemens Esprimo V5505 V5545 V6505 V6535 V6545 Amilo Pro V3505 V3525 Li1718 Li1720 Li2727 Li2735 Laptop (6 Cells 4400mAh 10.8V Black)

I bought this for a family member & it is working fine. Excellent product

Battery arrived quickly and despite the part numbers not matching the original battery it still clicked in and works. The problem is in the write up it says "lasts as long as the original battery" or something similar, it doesn't 😕general use, bit Web, listening to music, moving files to NAS drive and it's flat in around 2.5hrs. If I switch off WiFi and use lan I can stretch it to just under 3hrs. My original battery got 4 - 6hrs depending on what I was doing. I emailed the seller and got "please refer to amazon's community questions." Or as my mate puts it "we've got your money, get lost!". I've given it three stars as it does work, I might increase that if it's just the battery needing time to work in. There's plenty others out their that are cheaper and probably last just as long if not longer. 😐Update: even with very little use, mainly half a hour the odd time every few months, the battery is always flat if left (turned off). It now needs charging everytime I turn the laptop on 😕Complete Junk playing on the Eco Green label to boost sales. My advice buy another brand 😉