Should I limit my iPhone's charging to 80%?
Capping charging at 80% can slow battery aging if you charge often or keep the phone plugged in for long periods. iPhone 15 and later have a Charge Limit; older models rely on Optimized Battery Charging.
✓Sources reviewed 2026-09-10
Short answer
It can help when you charge frequently or keep the iPhone connected for long periods. On iPhone 15 and later, Apple's Charge Limit stops charging at a level you choose between 80% and 100%, which can reduce battery wear. On every supported iPhone, Optimized Battery Charging already delays charging past about 80% until shortly before you need the phone. The trade-off is carrying less than a full charge between top-ups.
Why
- Apple: on iPhone 15 and later you can set a maximum battery level like 80% to help reduce battery wear, especially if you charge frequently or keep the iPhone connected for long periods.
- Lithium-ion cells age faster at sustained high states of charge and high temperatures, so spending less time fully charged slows long-term capacity loss.
- Optimized Battery Charging (on by default) is Apple's gentler option on all models: it delays the final stretch of charging rather than hard-capping it.
Important conditions
- Charge Limit is available on iPhone 15 and later. iPhone 14 and earlier only have Optimized Battery Charging.
- An 80% cap lowers the range you carry between charges — fine for a predictable routine, less convenient before travel or a long day.
- Apple lets you override the cap when you need full range ("Charge to 100%" or "Allow Until Tomorrow").
- The cap is optional, not required: charging to 100% is fine for most people, and the setting mainly helps heavy or always-connected patterns.
What to do
- On iPhone 15 or later, open Settings → Battery → Charging and choose a Charge Limit such as 80%.
- Keep Optimized Battery Charging enabled instead of turning it off.
- Before travel or a long day, override the limit for that day when you need full capacity.