Battery drain on rMBP 13"

[jbachandouris]

Last night I charged it to 100% (well, the charger light was green). The lid was closed. I didn't open it once today until around 6PM EST and now the battery is less than 50%.

Coconut battery app says the battery is good. 285 load cycles. Full charge capacity is 6039 mAh (6559 mAh is design capacity). Age 1379 days.

I'm not opposed to replacing the battery, but if the battery is 'good,' I'd rather not.

Thoughts?



MacBook Pro (Retina, 13-inch, Early 2015)

 

[Howard2k]

Mojave and High Sierra both have serious issues.
Check this thread.

https://forums.macrumors.com/threads/why-do-macbook-pros-drain-battery-while-sleeping.2111961/

 

[triffdog]

I have Macbook Pro late 2013. I installed High Sierra and immediately the battery started to drain, visibly, by the minute. After ten minutes it had lost 20% of its charge.

I took to it the Apple genius bar and they told me that the problem was the battery and I would have to buy replacement. My battery was showing only 300 cycles and was perfectly fine before the updgrade.

After much prodding the Apple genius also told me was that when you upgrade to High Sierra you also get a firmware update which can affect how your hardware operates and performs on all machines, but particularly the older Macbooks.

So is the new firmware the cause of the massive battery drain?

While you may be able to retro-install older OS software to avoid the High Sierra glitches, you cannot re-install the older firmware so you're stuck.

If so it would appear that apple are deliberately designing the firmware upgrades to make the older machines obsolete or certainly less functional.