Just to say that the current that the 2500w 60v mopeds put through a 41 amp current. This seems to destroy normal batteries very quickly. I have had 3 sets, the originals, cheap batteries, and a gel pack from Haze. The last two packs lasted about 150 cycles only before dying. Could this possibly be the controller? Should I get a new controller?
Anyway I currently believe they simply are not designed to handle that kind of current. I have now ordered some Lithium batteries from ebay V power.