Smartphone users have been advised to stop allowing their phones to drain completely to zero per cent, as experts warn that the habit is one of the fastest ways to damage modern lithium-ion batteries.
According to battery and mobile technology specialists, the safest way to maintain smartphone battery health in 2026 is to keep charge levels between 20 and 80 per cent, a practice now widely recommended by phone manufacturers.
Why Letting Your Phone Reach 0% Is Risky
Unlike older battery technologies, modern lithium-ion batteries do not require full discharge before recharging.
Running a phone down to zero per cent places extreme chemical stress on the battery cells, gradually reducing their lifespan.
Experts also warn that leaving a phone at 0% for an extended period can trigger a “deep discharge” state, where the battery may refuse to charge again, effectively rendering the device useless.
The 20–80% Charging Rule
To extend battery life, users are advised to:
Plug in their phones once the battery drops to around 20%
Unplug when the charge reaches 80%, if possible
Many newer smartphones, including recent iPhone and Samsung models, now feature built-in settings that automatically stop charging at 80% to preserve battery health.
Heat: The Biggest Battery Killer
Excess heat remains the leading cause of battery degradation. Phone users are cautioned against:
Gaming or using GPS navigation while charging
Charging phones under pillows or in poorly ventilated areas
Using thick cases that trap heat during charging
Experts also recommend slow charging overnight with standard chargers instead of fast chargers, which generate more heat.
When 0% Is Acceptable
Running a phone from 0% to 100% is only advised once every one or two months, and solely to recalibrate the battery percentage indicator—not to improve battery health.
As smartphone prices continue to rise, experts say simple charging habits could save users from costly battery replacements and premature device failure.
