Batteries will all, at some point, get damaged by the recharging cycles, also original NP-W126 will ( run a search on line, several reports) albeit possibly later than third parties batteries.
My macbook battery swell up too (original part) and nearly destroyed the computer from inside this has nothing to do with parts being original or not. It has to do with the way some batteries respond to aging and repeated loading cycles.
Indeed even Fuji batteries are third parties batteries, Fuji doesn’t make them! They buy them under tighter specs than other makers but they are batteries like all others.
Duracell is a well known name but there is nothing in that name to suggest they are any better than other makers. They too will get damaged.
As soon as you notice bulging discard (dispose in appropriate manner) and replace.
As for batteries, quality varies greatly, have you read this?
Edited by milandro, 09 January 2017 - 11:16 AM.