I want to use a low power, ultra light weight solar charger for a three week backpacking trip. But I have heard that any shadows will lower the output causing the phone repeatedly start/stop charging. On an iPhone, this causes the screen to repeatedly activate for a few seconds to say "charging started". This uses a lot of power I can't afford to waste! Can I stop the iPhone from waking up the screen when its battery begins to charge? iPhone 5, iOS 9.3.5.
There is no native way to achieve this. Here are some alternatives:
1. Low-light mode. Go to Settings - General - Accessibility - Zoom - Zoom Filter - Low Light. Enable zoom, double-tap the screen with three fingers, and you now have extra low light mode.
2. Buy a solar charger with a built-in battery
3. Jailbreak. There are many tweaks on this, but I will not list them here as I advise against jailbreaking.