Introducing the exposure support cell 31 30cm cable this is a genuine exposure support cell with 30cm cable and is great for those longer rides where you unexpectedly need a little more battery power for your light this is compatible with all exposure lights with spt smart port technology the battery comes with a support cell connector included this allows you to charge the cell from either your mains or a usb charger it can fix to your helmet with the helmet clip and then fasten d