Convert an SAE battery lead (used by most motorcycle battery tenders) to a coax connector for the heated gear. This allows you to keep your battery tender on and simply bypass the battery harness with this SAE cable.
Battery tender harness may be smaller than 5 Amps. If you plan on using it for the heated clothing, please verify fuse size on the SAE battery lead prior to use, and replace with appropriate fuse. Inproper care can result in blown fuse.