I'm trying to come up with a bettery battery pack for my electric bike conversion and have found huge price differences between 9.0Ah D cells made in China and those made in Japan or France.
I get more than 10 Ah from the 3 new 12V 12 Ah SLA cells on my bike, using the 30+ amp full throttle very sparingly. That still only gets me about 10 miles in a half hour or so with a 40 pound battery. I really need to get twice that mileage and i don't like having to charge the SLA immediately after discharge. NiMH cells are the obvious answer, and i'm trying to determine whether the 9.0 Ah SAFT cell is worth 3x the price of the 9.0 Ah Chinese battery.
I want to build a 64 cell 40V 18 Ah pack out of 9.0 Ah NiMH D cells. I need 35A output for several minutes at a time. I can get Chinese cells rated at 50A for less than $6 and the SAFT cells are about $15. Can it really be that the SAFT cells will deliver 3x the performance? Anybody have any experience with this? thanks...