Originally posted by Johng
Using Tom's numbers, lets look at cost vs energy capacity;
The old standby: Nicad 2400 MaH, 6V, $45
Energy per dollar -> ( Mah * V)/ $ = (2400 * 6)/ $45 = 320MahV/$
The challenger: -> Li-ion 3600 Mah, 7.4V, $90
(3600*7.4)/ $90 = 296 MahV/$
So, the difference in direct cost vs the total energy capacity is about 8%. Pretty good cost for leading edge technology.
Of course if you need a new charger, etc that's a consideration. Not a cost that will likely go away if you wait a year though.
Good points john! BTW....Emory and I had the same discussion about Gary and the lithiums. The cells I am using are li-ion not the poly's (yet). There ARE cells coming that will give nicads a run for the money. There is one fault in your #'s above. The cells I am currently using are 4.2 volts, giving me a pack voltage of 8.4 so...
(3600*8.4)/$90 =
336 MahV/$
Plans are for Ocala this weekend, you coming? Call me
Todd