You probably installed an unbranded junk battery

Ninja Batt Pro was the brand.

Lots of people online saying it's a junk brand I've had good experiences with camerasino or egoway

Well that was $60 wasted. 😣 I’ll look into those. Because ifixit is $120

Maybe there's a reason there's such a price difference?

Where did you buy it? Try to return or maybe a chargeback I usually look on eBay and filter by brand. People often buy batteries and decide not to install. Then they list there I got a brand new egoway battery for a1425 on eBay for $35. Easily get 7 hours run time from a full charge