Symptoms
- Connected devices stop charging as soon as the power bank is plugged into a wall charger
- Power bank charges normally but won't output at the same time
- Manual doesn't mention pass-through charging support
- Devices charge fine once the power bank is unplugged from the wall
Likely causes
- CommonPower bank doesn't support simultaneous charge-and-output (pass-through)Many budget power banks are simply not designed to charge and discharge at the same time.
- PossibleTotal power draw exceeds what the incoming charger can supply plus recharge the bankEven supported pass-through can fail if the input power is too low for both jobs at once.
- PossibleSafety circuitry pausing output while charging for thermal reasonsSome banks intentionally stop output while charging to manage heat.
- Less commonInternal circuit faultIf pass-through used to work and stopped, the internal management circuit may be failing.
What to do
- Check the power bank's manual or product listing specifically for 'pass-through charging' support.
- If it's not listed as supported, don't rely on charging devices from it while it's plugged into the wall.
- If pass-through is supported, try a higher-wattage wall adapter to give the bank enough power for both jobs.
- Let the power bank charge to full first, then unplug it from the wall before charging other devices from it, as a reliable workaround.
- If pass-through worked before and has stopped entirely, treat it as a sign of aging internal circuitry.
Tools and parts
- None required
Power bank with confirmed pass-through supportSearch: “pass through charging power bank”
When to call a pro
No professional repair path; if pass-through charging matters to you, buy a power bank explicitly rated to support it.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.