Trickle Charge

Power & Charging

A low-current charging mode used to safely top off a battery at near-full capacity.

Once a lithium battery reaches about 80%, the charger switches from fast constant-current mode to a trickle (constant-voltage) mode to avoid overcharging. This is why the last 20% takes disproportionately long. Some devices let you cap charging at 80% to extend battery lifespan by avoiding trickle charging entirely.

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