Following with some interest but I'm not an electrical tech type of guy. I have two sets of these, one for my Mic (XSW-D TX and RX XLR) and one for guitar (XSW-D TX and RX63). They were working like a charm when I first got them no interference, for those who were asking. The duration is supposed to be 5 hours and previously when I tested them that's about what they were lasting.
When COVID came around and there was no gigs for all that time, I just let them all sit in the little carry case that I have for them and they ran completely out of charge and then just sat. I charged them up and went to the first gig but it wasn't long before I discovered that I was going to have to wire up for that gig. They just weren't holding a charge anymore.
So I contacted Sennheiser and they just said to take them to where I bought them for repair. I procrastinated and was going to take them down today but thought I better test them one more time before taking them down ... so I started charging both sets yesterday and they were all charged today. They seem to be working much better this time around. The mic set was pretty close to done after 3 hours, so I think I'll need to change the batteries on those but the guitar set is still going and pushing 5 hours.
After finding this thread I may see about trying to get the batteries and have a friend who is pretty good at this kind of thing do the work.
As I said I'm not a techy when it comes to this stuff, the 3.7v is obvious but the 850mah, I assume is the battery capacity and the 14500 is the size/shape. So the size and voltage will need to be the same but it looks like you can get this in up to 1100mah. If I'm interpreting correctly that should work and give me a little more battery life per charge like maybe over 6 hours?
