Sorry, Alk's are about all you can use. All batteries work by converting a chemical reaction into electricity. Cool the reaction down and it will last longer, but produce the needed byproduct at a much slower rate. Now, as with many other things, there is a solution in the not-too-distant future.... Super-Capacitors! Seams our firecracker friends overseas are working on changing the coating on the plates to hold 100 to 1000 times as much
power per given volume as
current caps hold. The real push is for
electric cars, but lets
face it, it will also be the death of the common battery as we know it! After all, who would want those little toxic waste cans in their flashlights if there was something that held up well and could be recharged as many times as you like. Of course, there will be the standard price curve to work through.......