20 Most Recent Sennheiser HDR-45 Consumer Headphones - Page 4 Questions & Answers

Obviously your rechargeable battery isn't getting charged. It's probably a good battery as it recovers enough to run for 3 minutes after you try charging it. (all that's happening is the battery is allowed to rest and it recovers a little bit of it's capacity.)
As to why it's not getting charged, it could be the charger or the wiring in the headphones or the wiring in the base or a few other possibilities. You didn't give us a model number or any other details so we can't get any closer than that.

Sennheiser Audio... | Answered on Nov 28, 2016

Search on internet for owners manual. There is usually a small set screw within mic to help with the gain/sensitivity.

Sennheiser Audio... | Answered on Oct 15, 2016

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