GSP-15 uses Zinc-Air button cells. They're pretty widely available; any drug store will have a decent stash. The units use the Number 10 size (color coded yellow.) I run them Saturday and Sunday for 8-9 hours each, then they sit unconnected (battery door opened enough to break the electrical connection) for the remainder of the week. They typically last 2 or 3 weekends before needing replacement.
A 60 count pack of these batteries runs about $15 from Amazon. Given that a single battery is less than the cost of a round of rifle ammo, it's probably not going to drain my wallet anytime soon.
A 60 count pack of these batteries runs about $15 from Amazon. Given that a single battery is less than the cost of a round of rifle ammo, it's probably not going to drain my wallet anytime soon.

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