Check the listing for details. Hotronic Battery Pack XLP 1P BT - 359. Color: Multi, Condition: New. Listed at 131.00 USD. With a compact design and 10 hours of constant heating power the HOTRONIC XLP 1P BT is a Lithium-Ion battery made to deliver high-performance warmth when it is needed most. These Bluetooth app driven controls allow you to access 6 heat settings and a Power Boost level from any iOS or Android smartphone. Customize your comfort throughout the day, there’s even a sleep mode for when you’re in transit or taking a break in the lodge. For the person looking for all day heat the XLP 1P BT is a less expensive option when compared to the 2P, and is the choice if you are confident you can recharge overnight between your days out and don’t need that 18 hours of power. If you’re taking these on winter camping trips, don’t anticipate being able to recharge, or just want more power so you can stay out well into the evening hours, pick the 2P.