Chosen Solution

I purchased a new battery from you and installed it. It worked great for a few days, but now it won’t hold a charge and macbook will only run when plugged in. I purchased a new charger thinking that might be the issue, but that does not seem to be the case. Macbook Pro mid 2012 13 inch Coconut battery screenshot

Let’s do some testing of the battery. Complete the guide below; be sure to upload an image of the coconutBattery window to your existing question! How to Test a Mac Laptop Battery Adding images to an existing question