I live in a tropical region which sees very hot summers, which we are experiencing currently. I have been observing for some time that the battery on my Apple devices are draining way quicker than they use to.
My recently bought, fully charged iPhones goes from 95% to around 25% charge even if kept unused, put on low power mode and running the latest version of iOS (both iPhone 7 and 1st generation iPhone SE bought under a year ago). I am observing the same with my iPad mini 4 (relatively old) and a recently bought Apple Watch Series 5.
Is there any technical reason and evidence or explanation thereof that would support this theory? Or could there be any other factors at play here?
I have not observed such battery drain pattern just a month or so ago when it didn't used to be as hot. Also, I do not use any kind of air conditioning, so the room temperature is usually higher than normal further aiding with device heating.