here are some ways to help battery life with iPhone SE1 tiny battery. Maybe these approaches will help yall with other Iphone models too. If you notice one way or the other, please do follow up with your observations and ideas. Thanks & TTFN ....
1 - Low Power mode. Gotta constantly put it back into low-power mode manually due to charging to 80 or 100%, but Just Do It.
2 - Turn off iPhone at night and extend iPhone battery life for 8 hours every day! (Leave ipad/mac turned on to get messages from Apple People. Android people can leave voice mail or green text message for morning when you turn on your iPhone.)
3 - Turn off vibration except when phone is on silent. Vibration is #1 power-sucking-alien.
4 - Turn off celullar radio or go airplane-mode if you are at edge of cell, like if you are constantly going in and out of tower range such as on a ski mountain. Also consider airplane-mode with wifi-on as a very cool power-saving method.
4 - Avoid heat while recharging. Recharge in coolest/nighttime/AC environment, not in summatime sunlight. (But not inside the fridge!). Phone charges more slowly from 80% to 100% to avoid heat buildup but still gets super-toasty.