Soul-
They come with a long wire with a connector in the middle. One end has little rings which thread though the bolts on the battery terminals, and you keep that end of the wire under the seat when you're not using it. When you want to use the gloves, you take the wire out from under the seat and plug it in. The connector in the middle of the wire is waterproof, but loose enough that if you forget you're connected and walk away from the bike at a petrol station, it pulls apart without hurting anything.
The gloves also come with batteries, but they only get about 3/4 as hot. The battery compartment on the back of the glove is very useful though. I used to put my work ID card into it, so when I got to the carpark barrier I could just vaguely wave my hand past the sensor and pretend I'd used my Jedi powers to open the gate.
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Bad_Science
I think mine are these ones, which are on clearance at the moment. If you've got a spare bit of cash, get them.
https://gerbing.co.uk/t-5-heated-gloves.html