Chosen Solution
Hi @purplepig, Perhaps the best that you can do is to search for a AHB472625PST battery. The number is the model number of the battery used in the headset, so presumably it should meet the same specifications as the Logitech branded one. As Logitech is not a battery manufacturer they will only be using a made to order, rebranded battery in the headset. Perhaps ensure that the replacement has a UL certification mark on it as per the original - see image below. Batteries with a UL Listing have been tested to meet nationally-recognized safety standards. They have been tested as complete final products
(click on image to enlarge)
