[RossM]

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.