New xcap battery not charging

I recently bought an xcap battery from injured gadgets and installed it on the 6s Plus. The phone turned on and charged fine so I fully shut it off and let it sit for a week or 2. Now when I go to plug the phone in it doesn’t draw any power and does not turn on. This same thing happened with the same brand of battery on the same phone. Both the battery before and this one had the same problem. Plugging the phone into a amp meter shows that the voltage drops from 5.25 volts to 5.23 volts but no amps are being drawn. Does anyone know of any solutions that don’t require replacing the battery? Thanks.