Chosen Solution
Hi I have a nearly 2 year old iPhone 6s. Just recently, months ago it started to act up and drain rapidly, the rate at which it drains fluctuates but sometimes it dropped one percent with a few minutes of light usage (browsing the web, Instagram, playing music) but at other times it may drop 5-6% in 2-3 minutes. I just got it replaced by Apple ($29) a few days ago and I’m having the same issue, although less severe. I just used my phone for about 25 minutes by browsing safari and listening to music on the app Musi and it went from 94% to 83% (at the time of posting this). Here’s what I’ve done:
- replaced the battery (81% capacity now 100%)
- turned off background app refresh
- brightness is a bit below halfway
- push email is off
- hey Siri is off
- Bluetooth and airdrop are off
- up to date at iOS 11.4.1 -location services on but limited to only some apps since I need to use them
- share iPhone analytics off and Limit as tracking on -fitness tracking off
It’s possible that the replacement battery isn’t that good. Unfortunately, with the design capacity showing 100%, I doubt Apple would replace it again for free. Has your phone been repaired recently? Sometimes partially defective replacement parts like a screen (esp. the backlight) or front camera/sensor flex can cause excessive current draw which increases the battery drain. I would go back to Apple as a first step and see what they can/will do. If they don’t change the battery, then you may want to start disconnecting things to see if you can identify a culprit.
If multiple batteries are still draining then you’ll need to check you Tristar (aka Power IC). Do this by leaving the battery unplugged and connecting a charger to the phone, a working phone will show an Apple logo and boot loop. A phone with a bad Tristar will not do anything when you do this.
