With aids in the charger,green lights blink for about 4 hrs and then go red. If pull plug and replug it starts blinking green again and goes red after a while . When I remove the hearing aids while the charger shows red, it stays red even when cover is open. This happens sometimes on one side and sometimes on both sides.
SOURCE: Siemens charger for hearing aids
Its a warning sign for a faulty battery, the red light comes on if the battery is faulty or if you are trying to recharge a non rechargeable battery.
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