Battery drains faster and startup chime changed after updating to 13.7

[LesterTwice]

As per title, the battery of my MacBook Air 8,2 2019 drains faster during sleep, I used to find battery charge at 100% while the Mac was asleep overnight. Now I find it at 90% and it drops rapidly below.
The startup chime clearly changed becoming high-pitched and contrasting with previous mellow sound (the typical Mac startup sound).

I reset SMC and NVRAM without result.

Does anybody else notice these issues?

 

[StoneJack]

As per title, the battery of my MacBook Air 8,2 2019 drains faster during sleep, I used to find battery charge at 100% while the Mac was asleep overnight. Now I find it at 90% and it drops rapidly below.
The startup chime clearly changed becoming high-pitched and contrasting with previous mellow sound (the typical Mac startup sound).

I reset SMC and NVRAM without result.

Does anybody else notice these issues?

Maybe its search indexing. you may want to erase and upgrade

 

[LesterTwice]

Thanks, but I strongly doubt that the usual Apple panacea of updating would work. Maybe a newer OS would be smarter in battery management, but certainly would put a bigger strain on battery with new features I don't need at all. Anyway I don't get why erase and not just upgrade.

As the battery drains even when the Mac is shut down overnight (though a little less), I tried to calibrate battery (yes, it shouldn't be needed anymore) and things look a little better. I'll keep an eye on it.

Sonoma is the the last upgrade available for my MBA, which can't install Sequoia. I mean that my hardware is old for Apple standards, and I think that maybe the firmware update included in 13.7 somehow laid bare hardware's limits. BTW, might firmware update be responsible for changed startup chime?