Originally Posted by
bikesafer
If I'm commuting and one of my lights that uses AA or C cell batteries, I can stop at any convenience store or walmart in an emergency and be lit up in no time, but if my battery goes dead in one of the flashlights that uses cr123 or some other less common battery, I'm stuck.
The battery life on those lights at maximum output is also a little short. I've seen some with max life at the max output at a half hour.
Your mileage may vary.
For the weight of two AA batteries you can carry a second (back up) CR124a. The life is over an hour each. Look ->
http://www.batteryjunction.com/4parc390reli.html A charger and
four rechargeable batteries for $28. 1000 charges per battery, You do not need to stop at a convenience store or walmart for
11 years!