Good Reliable battery?

What you are looking for is paying about $.50 for Watt/Hour ,your lead acid that you are using cost you $.25 W/H but you can only get half the energy of the batteries at the rate you are taking it out .
You will be very hard pressed to get high reliability , low weight and high cycle for less than $ 1.00 W/H .
Have some nickel-zinc 48 volt 30 A/H weight in about 34 kg that I would let go for about $ .50 W/H ,question is do you the room on your scooter and the charger ?
Regards
Andre

http://www.batteryspace.com

48v/1.2v = 40 NiMH cells required. At 10ah for D cells you'd need two packs in parallel for a total of 80 cells.

It'd take 5 of these: http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=710 costing $565.25

80 cells at 160g ea = 12800g/453 = 28.25 lbs .

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Avatar taken from http://www.electricmotorbike.org/
Anyone got one they might want to sell?
My KZ750 Project: here E.T.A. 1 mo

Glad you like them, I wasn't sure if I was giving bad advice. ;)

If you buy the tabbed onces, you might want to add some solder, as they've had poor spot welds on them in the past. It can damage the cells to solder to them, but I've done it and so have others without problems.

SLA charger will not work. You'll want a good quality NiMH charger. For charging it is probably best to build into smallest bricks possible while still practical. 12v might be good, but you'll need 8 chargers to charge all at once. You can't charge them in parallel, only one string per charger.

I've heard of batteryspace's NiMH chargers failing. They are a good source none-the-less.
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Avatar taken from http://www.electricmotorbike.org/
Anyone got one they might want to sell?
My KZ750 Project: here E.T.A. 1 mo

Interesting suggestion ! using the " D" . Have some apprehension regarding the internal impedance of the cells and also the reliability of so many intercells connections .
If I was doing this power pack would consider seriously the Panasonic HHR650D "D" cells measured as low as 2 milliohms per cell, their cost is however fairly high about $ 14 each . for a 6.5 A/H cell , have been able to take out over 250 Amps out of a single "D" for almost a minute.
Would suspect that the impedance of the Battery Space cell may be quite high ( over 10 milliohms ) and when the intercell connection are added quite a lot of power will be wasted in the battery pack .
Low impedance is as important as the A/H since it limit how fast and the percentage of the energy that can be taken out .
Somewhat surprised that cell impedance is not mentioned more when dealing with heavy discharge rate ( multiple C rate)

Amazed that you are able to power the bike with only 60 w/h which is about 1/10 hp !
Is the 1.2 A drain ounce you get up to speed or is that when you are accelarating ?
When measuring the 1.2 A what was the voltage at the motor ? ,not at the battery .
maybe you loose a lot going from the battery to the motor ! .
If this is the real current then you should be able to get at least 5-6 hours running
time on the lead acid pack 10 A/H divided by 1.2 = 8 hours due to inefficient should
get about 6 hours .

MY ERROR AFTER REREADING YOUR MESSAGE SEE THAT THE DRAIN WAS 1.2 C NOT Amps
the 1.2 C at would be about 12 Amps that is more like it = 600 W/H SORRY ! !

Another thing to consider is cell life. I doubt the Chinese cells would last as long as good quality Panasonic, Sanyo, or SAFT cells.

BTW, SAFT sells a 15 ah cell http://www.batterystore.com/Saft/VHF.htm

By only having to charge 1 string (and saving some on chargers) this might not be much more expensive.
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Avatar taken from http://www.electricmotorbike.org/
Anyone got one they might want to sell?
My KZ750 Project: here E.T.A. 1 mo

You could build a nice pack from about 13 Dewalt A123 Packs.

I've built a nice 36 Volt 11.5 AH pack from 5 such packs in parallel for my Aerorider.

I estimate it would take about 13 Dewalt packs (netting 4 extra cells) to build a 20lb, 20AH 48 volt pack, (This is bare cell weight, and does not include any of the extra weight it would take to tie the pack together) This would cost you about $1300 on ebay, but it would give you >2000 recharges, lasting quite a bit longer than most other batteries. (They also are stated to have a 5 year shelf life)

The cool thing is that it meets all your specs including your under 30 lb weight. They are also flat voltage wise until nearly the end of the discharge cycle, and can handle a nail driven through them....

Trying to figure out what type of battery to use on my electric rebel project. I've looked over a wide range of B&B batteries and am considering their agm as it can be mounted anywhere. I'd love some alternate considerations from anybody.

Also on the agm batteries, has anyone had experience with Powersonic, Eagle Picher, Toyo, universal batteries, or Panasonic. I've heard good things about B&B, and my father in law has worked with Eagle Picher, just looking for others experiences.

Planning on a 72volt system if that helps

In addition to the EB and EVP series from B&B, you may want to consider the Odyssey series by Enersys especially if price is not a problem. The other brands mentioned would probably not perform as well but may be much cheaper options though.

http://www.odysseyfactory.com/documents/US-ODY-AM-001_0406.pdf

Tysonic batteries are cheap.

I think most AGM batteries are about on par with each other. Exceptionally tough batteries are Hawker Enersys which makes Odyssey, Genesis, and Cyclone. Its more important how you treat the battery.
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Avatar taken from http://www.electricmotorbike.org/
Anyone got one they might want to sell?
My KZ750 Project: here E.T.A. 1 mo

Several years back had to come up with a 36 volts NC system capable of providing 5,000 peak power . I ended with 5 sticks of 6 cells stacked in length wise , the total connection impedance was about less than 20 milliohms , the total battery system impedance with cells and connection was 98 milliohms . we where able to pull about 150 amps , using the Panasonic HHR650D cell.
If you need help on how to weld them , call me ( 203)627-8426 Be glad to post a picture of the system , how do I bring it in from my drive ??
Regards
Andre

I've got lots of soldered joins in my nimh packs. Not really noticed any more voltage sag versus welds. Lots of RC types prefer soldered joins for lower resistance. The other options is making a tube under compression with silver paste. See http://www.modelelectronicscorp.com/products/SPTs/kits.php

There was a guy on the old voltage forum who used a piece of plumbing pipe there a link to a site somewhere, If I was gonna build one I'd try to use aluminium or ventilate the pipe as cooling very important for nimh

HCT,

Be glad to post a picture of the system , how do I bring it in from my drive ??

Upload your image to http://visforvoltage.org/user/174/imce, additional information can be found on the Help Tutorials or
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There are two ways to do this, the hard way, and the not-so-hard way. The hard way does not have an easy method to make the image display. The not-so-hard way is a little obtuse but does offer a way to make the image display.

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This is my first attempt to up load images to this site

The pictures are of a 5,000 W 36 volts pack and 28 volts 6.5 A/H Mil power pack to download
sensitive telemetry information both system employed welded cup to insure high reliability and
very low interconnect impedance ( each cell connection was less than 100 microhms ) any type of
soldering or pressure connection where at least 10 times higher under the best circumstance .

Regards
Andre

`HCT,
Looks like you did a good job posting the pictures.

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Moderator Team Captain

Moderators are community volunteers who help keep V is for Voltage Forums running smoothly, and provide forum support.

Top 10 auto companies in China have made aggressive plan on electric car but now they found a problem, where is the lithium battery?

Production capacity of Lithium battery for electric vehicle using is in small scale in China, big LiFePO4 battery producer like CALB, Winston Battery, Sinopoly Battery are tying their best to enlarge production.

CALB is a large state-owned enterprise, located in north of China.

“all of our factory is very busy and we have enlarge 5 production lines since last December” a senior manger from CALB said.

CALB don't accept small order now and even their bigger dealer in Europe can not get cells in time.

Some of CALB dealers have convert to sell battery from other companies, like Winston Battery, Which is located in the south of China.

Winston battery is a private company and they does not get so much order from domestic market, which take them focusing on oversea market.

Winston battery is our best choice now because they can provide battery cells in short time. And Winston battery is one of pioneer of high capacity LiFePO4 battery.

They start production of High capacity LiFePO4 battery from 1,999, 10 years earlier than CALB.

The boss of Winston battery claimed that Winston battery is teacher of CALB.

And he said that technology of CALB sourcing from Winston battery in 2009,when CALB was founded.

But they are rivals and it's the only relationship between CALB and Winston battery.