What Our Gearhead(R) Experts Are Saying: "This is the battery I trust for big days. The heat stays consistent and lasts through cold tours or long resort sessions, and I can tweak the settings from my phone without even removing my boot."For long days in the cold, we need gear that powers us through. The Hotronic Battery Pack XLP 2S BT delivers extended heating performance in a compact, lightweight format. Built with a 4400 mAh lithium-ion cell, this high-capacity battery fuels your Hotronic heated socks with hours of consistent warmth, controlled wirelessly through the Hotronic Heat app via Bluetooth. Its intelligent charging system ensures battery longevity while keeping the pack light and low-profile, fitting cleanly into your winter kit without weighing you down.