I have this mid 2010 MBP which I upgraded with more RAM, a SSD and a HDD replacing the optical drive. It works great and handles most of my computer needs. A few weeks ago it started to display a warning on the battery icon, saying the battery needs "repair". I've noticed that the trackpad is going increasingly harder to push, so I did some research and it seems that a bulky battery may produce that effect on the trackpad. I guess I should replace the battery because after 5 years I don't think the battery could be repaired by Apple. There are budget batteries in Amazon at about 60 euros, but they don't receive good reviews, some for short power delivery times after a few charging cycles, others for being too thick for the computer. Then at iFixit they have what they say is an OEM Apple battery at almost 100 euros. I have a couple of questions: Do you guys have any experience with iFixit products, are they reliable and worth the price plus? I've opened my laptop a few times, it clearly says "don't mess with the battery!!!" (or the like) Would I lose some information or damage the computer in any way by replacing the battery with a new one?