So we are about to upgrade our group to the sena 30K. We ride with enough people being able to use the group talk with mesh seems like a good way to go. I have replaced several batteries on our sm10 units, but haven't seen anyone out there doing it with the 30k. This is our only holdup at this point. If you have replaced your battery on 30k I would love to hear your perspective. I would also like to hear about how you think the mesh network performs compared to the smh10. Thanks guys!