It’s a great intercom and also a great video/still camera. But sometimes the battery doesn’t last as long as your ride if you are using it a lot. Here’s a photo of it, upside down and charging, on my helmet.
However, it isn’t charging from a wall plug or 12Volt socket, it’s charging from an add-on battery I glued to the other side of the helmet. See that photo here:
It’s really a small and very light mobile phone recharging battery power supply. Here’s a closer-up look at it plus what I used to glue it and some misc shots:
All in all, I don’t notice the negligible weight of the add-on power supply and it gives me all-day + use of the neat Sena 10-C.