Jeff, I thought I read somewhere that the MS-3 last only 8- 10 hours.
But if they last 20 to 30 hours, then I would only charge every 2-3 hunts.
Which wouldn't be that bad.
I have only used this machine approx. for 20-25 hours total, so It's new to me.
I also have a Minelab Equinox 800, and with the bluetooth headphones, I can pair it with my cellphone
and see the battery percentage on my phone .
I think this only works on late versions of android though.
So, want I am determining is, that this is a down side of the Z-Link tech.