Silent, quick-access emergency battery pouch. If your nods or other electronics go down unexpectedly you will have a dedicated pouch with a fresh battery literally at your fingertips.
 
Primarily meant to be helmet mounted but can be placed anywhere there is loop velcro.
The pouch is about 3 grams (without battery)
 
Two dummy cord tie-downs, one located on each side (Highly recommended to use)
 
This pouch can resist light rain but if where you are going to be is known to be wet it is recommended to waterproof your battery either with plastic and some tape, a ziploc, or a small vacuum-sealed bag with a quick tear-off cut.