Batteries wear out, but habits change how fast. Only the practices with evidence behind them.
Lithium-ion cells age fastest when drained near 0% or held at 100% for long. Frequent small top-ups between 20% and 80% are kindest to lifespan. The 'optimised charging' or '80% limit' setting on modern phones automates exactly this โ leave it on.
Temperature affects ageing more than anything else. Gaming while charging, leaving the phone in a hot car, or fast-charging inside a thick case all build heat. If it feels hot while charging, take the case off and keep it out of direct sun.
The display is the largest daily drain. Auto brightness, a short screen timeout and dark mode (only on OLED) make a real difference. Trimming background refresh and location permissions per app cuts idle drain too.
'Resetting' a battery by fully draining it dates from nickel batteries; it harms lithium-ion. Third-party chargers that meet the spec are fine, but avoid ones that run hot or list no output rating.
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