Ok so I had a power surge before Christmas and my MacBook was charging at the time. It fried the MagSafe port, but everything else worked fine. It just wouldn't charge. In fact I backed it up, turned it off, turned it on a week later, did some browsing, turned it off etc. I took it to apple mid-Jan who tested battery, said it was fine. Tested MagSafe board, not recognised. They charged me $200 to replace MagSafe board which I thought was a bargain and readily paid to get my MacBook working again.
I appreciate it's a 5yr old machine, but like most people who use a laptop daily you have a fair idea how long your battery will last doing certain tasks. When it came back with a new MagSafe board it was draining 8% overnight with the lid closed and 'sleeping'. Not normal behaviour and it wasn't doing this before apple repair. Remember I had it for about a month after power surge, before repair and it didn't drain like this.
I was obviously a bit upset, but since I have owned macbooks for about 12 years now I had a suspicion. I upgraded to the new OS Carolina and now battery drain is back to normal…
What would have happened that made the battery drain so much worse pre-update?
Am I just paranoid or is this indeed the doing of Apple themselves? In an attempt to get me to either buy a new MacBook or upgrade the OS.
I don't know about you guys but I have had plenty of times over the years where something stops working properly overnight and doesn't work again until I do an update that had been pending for weeks/months.
I don't think I'll get another MacBook, even though they are well built machines and I get 5+ years of use out of them.
TLDR - MagSafe board was fried with power surge and after apple replaced it the battery drained super quick until I upgraded to OS Catalina, something that was pending for months prior.