Currently, I have an A1398 with Monterey 12.7.6. I changed its battery a few weeks ago. As far as I got this thing as a gift I can't tell you the previous experience. After installing the new battery, I got 3.5 hours for 70% of the charge. But after this, the battery performance started to drop. I barely get 1.5-1.9 hours max, but the battery performance is not the same every day. The day before yesterday, I got 3.5 hours doing the same work. I usually use discord,firefox with 4-5 tabs open,what's app and steam all these software run in the background. I went to the place from where I changed the battery they checked the battery and later said there's nothing wrong with the battery. There might be a problem with the Mac. Also, I am thinking to move to sequoia what's your opinion on this, let me know. submitted by /u/HYDRURBERG [link] [comments] [► Source]
Battery issues with my macbook pro a1398 mid 2015