Re: EV digest 7078
The Ni-MH issue is only with the large formate batteries. You might look harder on the Internet for less expensive Ni-MH batteries. It seems Toyota has gotten around the restriction by increasing the number of power cells that they are using currently in the Prius to power their next generation of plug in Priuses. The prices of the market cells have come down a lot. You might look into powering your bike with AA Ni-MH cells or D cells. You could probably pick them up in AU saving your self the shipping costs.
Try Tenergy sold at All-Battery on the Internet.
Tenergy has a tabbed D cell battery that costs 7.95 and is rated at 1.2 volt at 10 Ah. To get the 36v 40Ah you want should only cost you around 950 dollars. They may give you a break on price if you tell them you are buying 120 batteries. I believe you can get them even cheaper if they don't have tabs to weld them together into one pack. Also try looking up a company called CTX. They have a D cell that is rated at 13.5 Ah. It costs more but in may reduce the size of your pack.
Keep us posted on your project I want to see the end results.
1) Ni-MH cells and Chevron
by James Drysdale <[email protected]
First up, if you don't know me here, its because I don't yet have an EV
and don't really have much to add to the discussions that go on here.
Secondly, I am not a troll, and am building my first EV, an electric
bicycle, and thankyou to those members that gave me assistance.
The battery capacity for my bicycle that I was originally aiming for was
40Ah. I thought Ni-MH would be a good solution as lead-acid would be
very heavy and as it was a relatively small battery, the cost of Ni-MH
cells would be okay.
What I found was that Ni-MH was more expensive that what I expected.
Even when I contacted an electronics wholesaler, on the recommendation
of one of their resellers, using 600 2Ah cells to obtain 36v and 40Ah
would cost $AU1800 ($US1540) That is for cells only.
There was another bicycle battery thread here which I responded too, I
think I gave different costings then, but this is what I have worked out
with my most recent data.
I have been researching more.
Chevron own the rights to Ni-MH technology?
Or just a certain method of manufacturing NiMH cells?
Apparently they sued Panasonic for $30 million over an EV-95 line of
So is it true that a large entity owns the patents for Ni-MH technology,
and as this entity has more to do with oil, "restricts" the availability
of Ni-MH cells?
"Chevron's unit that controls the patents, *cobasys, *refuses to sell
their version of the battery unless, they say, they get "a large OEM
order". Apparently, they also refuse to let anyone else sell it, either"
Is this why lead-acid is still the only viable technology? Even for a
Is there some Chinese or Taiwanese manufacturer that builds Ni-MH cells
free of restraint from Chevron?
I did find a couple of companies supplying cells, my bookmarks were
deleted with a we browser update, so I don't have their addresses :-(
But their prices, although a little lower, were not enough to justify an
international order, particularly once shipping was added.
Is Nickel Metal Hydride cell technology restricted world-wide by a
company that has its stakes in oil????