Is there a high capacity battery replacement for the Samsung s4 MINI?

[AC Question]

My Samsung Galaxy s4 mini is about four years old and no longer holds a charge for more than a few hours. I know I need a replacement, and wondered if there was anything better than replacing it with the OEM battery?

 

[Rukbat]

There's this, but it makes the phone thicker (they include replacement back covers for an additional $8). Twice the capacity of the stock battery. You'll find stock thickness batteries at around 2000mAh, but that's not really any improvement.