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Yes, this is common, especially on devices with lithium polymer type batteries. If you are competent with basic disassembly of electronics, you will be able to open the headphones and see the battery (only attempt this if your warranty has expired, otherwise make a claim).
Usually they put the part/model number where you can't easily see. If you Google the part number you will find a replacement from eBay or Aliexpress for only a few dollars - but be prepared, shipping is slow.
Don't know about the expected life of these batteries.......as an 800 owner, would be interested to know if you kept the head phones regularly charged, or whether they possibly sat in a cupboard for extended periods without being charged?
I don't use the head phones, but every second or third time I charge up the Nox, I also give the head phones a charge as well.
Con 22 I think I will start the ball rolling by contacting the shop I bought the Nox from. A team thanks for the info diy repair will be my last resort. Katabatic I will check with the supplier if the warranty will cover the batteries in the headphones. I used the headphones regularly enough they would had some charge 90% of the time.
A good example - My Minelab GPX5000 had a 3 year warranty on the control box etc. The Lithium battery only 6 months. The battery also contains the audio preamp. At the 2 year mark I found no audio, speaker or phones.
I went to Coiltek in Maryborough where I bought the detector new and by process of elimination, determined it wasn't the detector, phones or speaker. but the preamp circuit. They said the battery was out of warranty but they could send it to Minelab for repair at my expense. I only had a week left before returning to Adelaide, so it would be quicker and cheaper for me to take it in personally as at that time I lived 10 minutes from the factory.
On taking it to Minelab, I argued that the preamp was a remote part of the control circuitry, not the battery, they agreed and the circuit was replaced at no charge by the next day.
Shout out to Minelab for the prompt fix, a bigger one to Coiltek as they lent me one of their hire batteries for the remainder of that trip at no cost.
Which is why I noted dealer/Minelab as a first contact. The worst outcome is a "No". and some cost.
Condor 22 Today I phoned the shop I purchased the Nox from. They confirmed the 3 year warranty on the headphones as well as detector so ill see the blokes at the shop next Wednesday. So going on your outcome with minelab lm confidant that headphones will be repaired or replaced.