You will defiantly want to get this if you purchased the heated vest or jacket. You dont have to have it but its nice to have if your other battery dies and you cant charge it right away.
Exactly as represented.
This provide the energy to keep my hands warm.
Good Batterys. I would buy again
I use these batterys in my ski gloves and they seem to do the job of keeping my hands warm on those really cold days.
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