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I love having this backup battery for my heated vest—it fits perfectly into the same pocket and charges up quickly. Now I can stay warm all day without worrying about the first one dying midday.

Swapped this in mid-afternoon and got a solid few more hours out of the vest, which was a lifesaver on a chilly walk. The connection clicks in securely, no fiddling around. It’s heavier than my main battery, but that’s the trade-off for staying warm longer.

I was worried my old battery wouldn’t last through a long winter walk, but this spare one matches perfectly and clicks in securely. It holds the charge just as long as the original, so I can swap without any drop in heat. Now I never have to cut a trip short.