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In Rarotonga in the winter months you can buy puffer jackets with copper wiring sewn to the inside with a 9V battery.

• mistermann 12y ago
  Very cool....how long does it last?
  • gambiting 12y ago
    http://www.engadget.com/2011/03/04/columbia-omni-heat-circuit-breaker-softshell-electric-heated-j/ http://www.engadget.com/2011/03/04/columbia-omni-heat-circui... Apparently 5.5h on maximum power,which is pretty impressive.
  • draven 12y ago
    Some heated motorcycle jackets can be plugged to the bike's battery (you just have to install the plug somewhere accessible and connect it to the battery.) Then when you get on your bike you just have to connect your jacket and off you go. The alternator provides the power during your ride. For ex. stuff like that: http://www.revzilla.com/motorcycle/gerbing-12v-ex-heated-jacket http://www.revzilla.com/motorcycle/gerbing-12v-ex-heated-jac... Together with heated grips, cold is not an issue.