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.
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LOST A BATTERY? We Highly Recommend:
| 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. |
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