| CPC H05B 3/34 (2013.01) [H01R 31/065 (2013.01); H05K 5/0086 (2013.01); H05K 5/0213 (2013.01); A63C 11/228 (2013.01)] | 22 Claims |

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1. A system adapted to connect to a mobile phone to maintain a battery power of the mobile phone in cold temperatures; the system comprising:
(a) an outer layer configured to transfer heat;
(b) a heating layer comprising a heating device chamber to receive a heating device;
(c) a heating device positioned in the heating device chamber;
(d) an insulation layer against the heating layer, the heating layer being between and against the outer layer and insulation layer wherein the outer layer, heating layer, and insulation layer are reversible to reverse a direction of heat transfer;
(e) a fastener arrangement to removably fasten the system to a mobile phone.
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