Hotronic Battery Pack Power Plus m4 (Each)

Additional Battery Packs extend total foot warming duration throughout extremely cold days.

With four (4) cells in each Battery Pack, the Power Plus m4 is Hotronic's most powerful, longest lasting Battery Pack Ever!

WARNING: The Power Plus m4 Batteries can only be recharged using the Hotronic Power Plus m4/m3 Recharger, with the white plugs.

LOST A BATTERY? We Highly Recommend:

• Slide Strap Brackets, Mounting Brackets, or Velcro® Attachment Straps to secure your batteries to your ski boots.
• OR Extension Cords for mounting your batteries at your waist or chest.

Temperature and Duration Settings Setting Approximate Average Temperature Duration Range °F °C 1 83 - 89 28 - 32 19 - 21 hrs 2* 96 - 106 36 - 41 7 - 9 hrs 3 105 - 116 40 - 47 5 - 6.5 hrs 4 135 - 144 57 - 62 2.5 - 3.75 hrs Based on Battery Packs at average -20°C (-4°F) ambient temperatures. * Setting 2 is the most common setting.