Realistically, you’d only need it to last a couple of days, as you’d charge it before a mission anyway

My Instinct Solar lasted 3 months without charging

Edit: it’s more about the features like the ballistics calculator and GPS than the battery anyway.

I had this patch on my JPC on deployment, thought you’d find it humorous

They’re issued Garmin Tactix’s now, although they aren’t wearing them in the picture