Short lifetime (seconds to minutes) high output, store inactive until 
needed batteries.
Thermally melt eletrolyte using Potassium perchlotrate and iron powder 
(!)

>
Ejection seats and cruise missiles use thermal batteries - these are 
awsome and would (and probably do) work well in rocketry 
http://www.epcorp.com/NR/rdonlyres/2216D871-DE02-46E5-B5DC-A780302CE307/0/ThermalTable.pdf
/>


More usefully:

        http://www.epcorp.com/EaglePicherInternet/Technologies/Power_Group/Defense_Applications/Products_Services/

Basic description of how they work

        http://www.epcorp.com/NR/rdonlyres/F3E95B16-6BB3-42D0-8AF4-727DBA26C113/0/ThermalDesign.pdf

"Pardon me, Sir. Have you got a LEUP for that battery?"


        RM




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