I call BS on this...I get great battery life on my old A1387 4s but after resetting it and ONLY WIFI +3 Apps the thing is SOOO POKEY. I only use it for pomodoras with my ticktick task manager and every single system is disabled which includes iCloud mail message phone everything...
I am currently on 9.2.1 Verizon 4s and suspect this late stage update is to reverse the batterygate malware bc there is absolutely no way this device was so slow 6 years ago.
Like I said, factory reset a few months ago only apps are tick tick and the Bluetooth app to control my decora light switch.
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OMG my iPhone 4s factory reset WiFi only with 2 apps installed for my ticktick pomodoras is such a DOG! I know it's crippled bc it's impossible slow