Have you tried prying open the case? It has been a while, but I remember popping apart the battery/rear light (vis360+) to check the weather sealing (not impressed, as an aside). Cannot recall the battery, but I wonder if there is not a DIY way to replace it like you can do with other brands (Cycliq comes to mind). Not exactly apples to apples, but worth a try if Light and Motion does not reply. I remember the company offering service for their lights, but wonder if that is no more. The design and quality of the newest version of the Vis360 seems to be less than the previous model, which makes me question if they service their lights.