These 12V 3A batteries are exclusively for KLAN's and Macna's heated gloves and socks (except for the Macna Foton gloves). They come in pairs, as gloves and socks also typically come in pairs.
At 12V 3A, these are the "big" guys. They are better suited than their little brothers(7.4V 3A) for the real cold, but real cold also requires more energy, so one discharge session doesn't take as long. The battery charger and adapter are included, of course, but on the road it is something to keep in the back of your mind. How long a battery can guarantee warmth, depends to a large extent on the heating level (4 settings).
All of KLAN's and Macna's heated gloves are equipped with a storage compartment for batteries. These weigh 165 grams each and require 40x60x10mm of space.
If you prefer to use the motorcycle battery, you can easily achieve the desired arrangement with a number of cables.
ATTENTION! Heated jackets and pants run on different batteries!