MacBook Pro doesn’t turn on without charger MacBook Pro 2012 non retina model 13.3 inch.

I am trying to turn on MacBook with a replacement battery 11.1 V, 6000 mAh, 66.6 W I installed myself.

The original battery was 10.95 V, 63.5 W.

The MacBook turns on &amp; replacement battery charges when the charger is connected, but when charger is disconnected the MacBook turns off. That is I cannot turn on MacBook without the power adapter with the new replacement battery.

Original battery info 


New Replacement battery info
Looks like your new battery, from the screenshot above, is only supplying 7.3V, which is presumably too low to power the motherboard sufficiently on its own, it should be closer to 12V.

So your battery might be rated 11.1V but it appears to be faulty, although it is not self-reporting as such, maybe because the mAh rating and cycle count is still ok.