Usually, a decent power bank can be left charging overnight. Like phones, most modern power banks have charging protection.
Can you leave a power bank charging overnight?
TL;DR
Usually yes. Use a quality charger, keep it cool, and avoid damaged cables.
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Do not charge a power bank under pillows, blankets, or in direct sun. Heat is the thing to avoid.
If the power bank swells, smells strange, gets unusually hot, or has a damaged port, stop using it.
Cheap no name batteries are riskier, so use reputable brands for anything you charge often.
A power bank can charge overnight, but only if the device and cable are in good condition.
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