Ive been using it for a while and it has performed just fine it hold the charge just like the factory one although i did have some difficulties with it since the computer turned off sometime when moving it around i was getting ready to return it but upon inspections i found out that my computer was a bit loose on the clips that hold the battery in place so i placed some tape on top of the connector so it forces the battery to have a better connection and so fay no sudden shutdowns or any other problems the hibernating capabilities the battery percentage temperature the running time and everything else seems to be working fine at first some calibration was needed so i fully charged the battery then fully discharged it and finally charged it again so now its perfectly calibrated and performs just as it should overall im quite happy with the performanc