macOS Mojave battery drain

Same here. Battery life is terrible now. I can barely get two hours out of it and it shuts off when it gets to 35%. Start up is wonky, too. Two thirds of the way through the progress bar of start-up the screen goes black and I get the dreaded beachball for about 20 seconds before the desktop launches. Then, it reverts my desktop image to an older one. Weird. NONE of these problems occurred before the Mojave install.

I tried resetting PRAM and the SCM, both. Neither process fixed the issue.

Me too. 2015 13" MBP, Charged 100% last night. This morning I opened the lid to find I only have 60% battery after 8 hours. Never happened before. Similarly, I have wifi issues connecting (or not) to different networks after upgrading - but I'l post that comment in the wifi discussions.

Apple - we need a patch for wifi and battery drain please.

Good point. For me the pmset -g said:

sleep prevented by AddressBookSourceSync, coreaudiod

So I'll try to quit AddressBook and see what happens.

Please Apple, you need to fix this! While sleeping my battery goes from 100% to 40%. Before Mojave the behaviour was from 100% to 95%!

I have the same exact issue. I have a MacBook Pro 2016 13 inch with Touch Bar. Computer was completely charged last night. When I opened it about 10 minutes ago, the battery had drained down to 55%. This needs to be fixed ASAP!

I too have the same problem with my 13 inch macbook pro retina early 2015 edition. Battery drains multiple times faster than that was with High Sierra. My battery is healthy still only 130 cycles old.

I am experiencing this issue as well. It appears to be the kernal_task process that might be the culprit. I noticed my 2018 MBP was hot inside my bag after only a couple of hours of what should have been in sleep mode in my bag (I do not have power nap enabled when on battery). When I pulled it out, I immediately opened activity monitor and saw that kernal_task was using as much as 800% CPU (generally 100% CPU equates to full utilization of 1 CPU core/thread, so in the case of my 6 core i9, I could potentially get to 1200% since it has hyper-threading). That type of CPU usage would be extremely heavy type use, so there is definitely something wrong.

This needs to be fixed ASAP because the heat being produced doesn't seem to be tracked by the OS. Once I opened my MBP, it realized it needed the fan and kicked into high gear. This issue could result in CPU, logic board, battery damage and other things. It has already resulted in a few unnecessary cycles for my battery.

Hi,

I have exactly the same issue with my Macbook 12".

I charged it full yesterday evening but this morning i had approx. 45% left of battery time!

This issue has never happen before upgrading to Mojave!!!

Please help with this issue!!!

2015 MacBook air same issue...

I was on Sierra 10.12.6 before updating and I would get a few days of light usage!

Battery is halved now, or even less. Drains heaps during sleep each night, I've even turned wifi off some nights.

Same issue here, MacBook Pro 13`, 2016. It drives me crazy, 30% gone after 1.5 hours of usage. Started right after migrating to Mojave. Still an issue after one week of using it (so its not background indexing).

Same here, just updated from El Capitan (Macbook air mid 2014) , and the battery percentage is getting down so fast compared to El Capitan, please, fix this, thanks god i did clone the whole disk (bit to bit).

Wow this seems to be a genuine and huge bug in Mojave. I ran the update last night and today closed my MacBook for 3 hours only to find I’d lost 30% in that time. I’ve had to switch computers to get my work done now 😡. Under high Sierra this wouldn’t have happened.

I have encountered the same issues. I have a MacBook Air 2017 and the battery drops 21% after whole night on sleep mode. I have done some research and saw a solution provided from Apple tech. I tried that solution and the battery issues is gone.

The solution is resetting SMC and PRAM.

1. Reset SMC:

- Shut down MacBook

- In shut down mode, press "shift-control-option-power" key together for 10 seconds

- turn on power

2. Reset PRAM:

- Shut down MacBook

- right after press power button, quickly press "option-command-P-R" key for seconds until it reboots again, then you can release those keys.

- Let it reboot and run to system login

Those two steps should resolve the battery drain issue.

I did those two steps and my battery drain is back to normal rate.

I updated MacBook Air to MacOS Mojave when it became available. In several days, my battery started die in 4-5 hours. Then, notification about battery health appeared(computer is pretty old so it is logical).

Now, it is alive only for 3 hours. Before new macOS, it was alive for at least 8 hours. Maximum capacity of the battery decreases rapidly. 2 days ago it was 4800 mAh, whereas now It is 4300 mAh.

Don’t want to become that Windows guy with charging cable tail...

I have the same problem too.. I have MacBook Pro 2017, just update to MOJAVE 3 days ago.. now my battery life only last 4 hour on my daily use, its so depressing i usually get 8 hour more..

I think I am going back to high sierra until apple release another os update with no one complain about this anymore..

cheers

Ditto. Resetting VPRAM and SMC has done nothing to improve the situation. My MacBook pro has had it's use when mobile reduced by half which defeats the point of a laptop.

Go back to High Sierra seems to be the only option. So disappointed in Apple with this.