With the recent availability of cheap A123 20ah cells I'm seriously considering upgrading my 24 Calab 40AH either completely or a 20AH sub pack. The CALB's are rated at 3C where as the A123's are reported to be 15C continous. Although I've been very happy with the Calabs, they were a huge improvement over the AGM's....15C cells are hard to ignore! Makes me think, I have about 75 cycles on my Calabs that were supposed to last me some 2000 cycles. Does cycle time really matter in a technology that is improving so much every year?