2011 MBP – Is iFixit the best source for batteries?

The iFixit battery for my iPhone 6S worked perfectly or quite some time (before I got my 12 Mini) so I chose them for my replacement battery in my 2011 MacBook Pro 13″.First battery toasted a cell just a few months outside of the warranty period. Suddenly said only ~80% health with only ~70 cycles and would instantly drop from ~40% to single digits, and would get rather hot while charging.They offered me an out-of-warranty discount on a replacement. The replacement battery made it 4 months and about 30 cycles before also losing a cell and dropping to around 80% health, saying it was fully charged and then suddenly saying zero charge, and also heating up.Interestingly, the failed batteries also cause the computer to run laggy. When the batteries are brand new it’s noticeably smoother.Luckily they replaced the second one under warranty at no…

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