AAA battery is used in Bose noise canceling headphones. Alkaline battery lasts about 24 hours of use. Rechargeable lasts about 8 hours with original charger. With new more expensive charger, same battery lasts about 1-2 hours.
Either the batteries are used up an cannot be charged any longer or the charger is broken.
SOURCE: Energizer CHDC charger suddenly not indicating if charging or not
It sounds like the PC Board which provides the circuitry for the Charger's indicating light is malfuntioning. If you have a DC volt-meter, you can check the Charger's output voltage, and then the Battery voltage to determine if your charger is functioning.
Hint: If the Charger has an output voltage, but the Battery's voltage is less than its rated voltage... it's time for a new battery.
SOURCE: energizer CH2PC-UK battery charger' how long do i
Charge time depends on the mAh capacity of the batteries (should be listed on the package, or the side of the battery) most AAAs are under 900mAh so 2 hrs should be sufficient, but AAs vary greatly in capacity so heres a link to check after you look up your mAh rating
http://energizer.com/SiteCollectionDocuments/pdf/rechargeable/CHDC.pdf
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