What Our Gearhead(R) Experts Are Saying: "I use the XLP 1S BT as a backup for longer tours or road trips. It's compact, easy to manage, and I love being able to control the heat right from my phone."The Hotronic Battery Pack XLP 1S BT delivers reliable warmth in a streamlined package. Whether you need a spare for extended trips or a lighter-weight setup for shorter days on snow, this compact lithium-ion battery is designed to keep you warm without getting in the way. With Bluetooth integration and Hotronic's heat app, you can fine-tune temperature settings straight from your smartphone, making on-the-fly adjustments easy without removing gear. It's fully compatible with Hotronic heat socks and integrates seamlessly into your existing system for dependable cold-weather protection, wherever winter takes you.