I have a MacBook Air 2015 (13-inch). Bought it in oct 2016 and has been used decently since (5 years). Obviously, I have started having issues with shorter battery life (coconut battery says 30% – 40% capacity). I am thinking of getting a new battery, but before that I wanted to clarify something.
Whats weird is that the laptop shuts off (or sleeps) at 80%-90% battery (as said by the indicator at the top). I found this weird as generally, if the battery was bad the battery percentage would drop to 0-10% and then shut off and the battery would drop quickly. Why would a bad battery shut-off at 80%-90% indicated.
I searched this up and many websites said to reset the SMC, which I did but did not get anywhere with battery turning off at 80%-90%. I also tested the SMC if it was working. The keyboard lights works, the auto-brightness function works, the apple start-up chime works.
So my question is, is the battery bad?, is the SMC bad even though it seems alright? or both? or something else? I do not want to waste getting a new battery unneccesarily.
$ pmset -g log | grep -i "shutdown cause"
2021-11-04 17:47:51 +1100 ShutdownCause SMC shutdown cause: 5: Software initiated shutdown
2021-11-05 09:00:23 +1100 ShutdownCause SMC shutdown cause: 5: Software initiated shutdown
2021-11-06 12:25:48 +1100 ShutdownCause SMC shutdown cause: 5: Software initiated shutdown
2021-11-07 15:39:17 +1100 ShutdownCause SMC shutdown cause: 5: Software initiated shutdown
2021-11-08 10:42:34 +1100 ShutdownCause SMC shutdown cause: 5: Software initiated shutdown
2021-11-09 08:25:13 +1100 ShutdownCause SMC shutdown cause: 5: Software initiated shutdown
2021-11-10 07:38:39 +1100 ShutdownCause SMC shutdown cause: 0: Battery disconnected
2021-11-10 10:28:37 +1100 ShutdownCause SMC shutdown cause: 0: Battery disconnected
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