I just received mine for the MPB 2015 this week, original battery (which I doubt was genuine) is bloated, but still held up in terms of capacity to originals according to coconutBattery[0]. Will monitor the iFixit one closely as well. But I still trust them better than random China or local seller.
The degradation is the real problem. They hold up for the first tens of charges but quickly lose 20-50% of capacity. It might have to do with the lack of OEM charging circuitry on the replacements, or perhaps just shoddy quality
Would capping the max charge at 80% make any difference for this? Apple seems to do it with their latest phones and laptops. I don't plan on using the laptop on battery for long times. So my main concern is just keeping it at a 2-3 hour capacity for the upcoming years (mostly plugged in) and not having it bloat up like the previous one, making the laptop a fire hazard.
Correlates with my experience of late 2013 MBP batteries (it might be the same model actually). My original Apple battery lasted until 2019. Both of the iFixit replacements have lasted a year until not holding original charge, and just last night I noticed a cell starting to swell.
I doubt I'll ever find factory original cells again for the 2013 but if Apple sells them I'd consider buying a MBP again.
