Just spotted these, 10AH NiMH D-cells.
http://www.batteryspace.com/index.asp?P ... ProdID=325
Unfortunately it has a maximum discharge current of 50A whereas I think the cells used in the Insight happily cope with 100A.
Still though, $5.56 each means $670 for a pack's worth, and if you bought twice that amount you could possibly run parallel strings for discharge (if there's room).
http://www.batteryspace.com/index.asp?P ... ProdID=325
Unfortunately it has a maximum discharge current of 50A whereas I think the cells used in the Insight happily cope with 100A.
Still though, $5.56 each means $670 for a pack's worth, and if you bought twice that amount you could possibly run parallel strings for discharge (if there's room).