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Repair guides and information for portable, battery powered Bluetooth speakers

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Onn. wireless Bluetooth speaker won’t turn on unless plugged

I have the Onn. Medium Party Speaker with LED Lighting. It’s supposed to be a wireless Bluetooth speaker. It is fully charged but won’t turn on unless it’s plugged in.

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Hey this is most commonly a battery issue.

If you left it discharged or did not use it for a while, it is possible that the battery dropped below a threshold voltage. What happens than is the BMS(Battery management system) can prevent the battery from charging as it has dropped below what's considered a safe level.

This essentially cuts off the battery from your device, resulting in the symptoms above. Your device will work when plugged in and will commonly show full battery when trying to charge as there will be no battery to charge.

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Is there anyway to reset the battery management system to allow it to charge again?


@izaac adamson Unfortunately the only way it can work is if the battery is over the certain threshold voltage.

To charge a battery with voltage this low you would typically use a lab bench power supply. Other makeshift ways are also possible, but its definitely not as safe nor as good as replacing the battery.

Essentially the easiest and safest repair in this case is just a plain battery replacement.

Good luck !


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That’s normal, my Bluetooth headphones (Sony) do the same thing. I don’t know why but I think it’s supposed to be that way.

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Oops, I miss read. I thought she said it wouldn’t work unless it was unplugged.


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