Portable Battery Charger Ultra Mini AA Battery Powered Emergency Cell Phone Charger Travelling Backup Chargers for Android Smart Phones (Red) - 2024 reviews - Whydis

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Portable Battery Charger Ultra Mini AA Battery Powered Emergency Cell Phone Charger Travelling Backup Chargers for Android Smart Phones (Red)
- I have tried all the battery chemistry I have (alkaline, NiMH, lithium) but the charger emits a loud high pitched squeal from each when plugged into a device.