Agreed. I read up on this and got a 4 pack of Lithium Ultimates for my gift-flashlights.
Man, I wish I had a charger for a 10440...I'd love to try it in the A3. I mean, the A1 works with RCR123 3.7Vs and is shorter and a bit fatter. So for short periods, I'd think the 10440 would work fine.