If you do go with the CR123 (Smaller pen) then here's a place to get a charger and 4 rechargeable batteries.

4 Pack RCR123A 3.0V 900mAh Rechargeable Li-Ion Battery with Smart Charger
$28.95
http://www.batteryjunction.com/4parc390reli.html



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Failure is not an option!
USMC Jungle Environmental Survival Training PI 1985