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[EVDL] Best bang for the buck battery

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#1 ·
Hi EVeryone!

I don't follow this list real close and I realize many of
the discussions here are related to the various battery
technologies both old and new. Hence, I'm not up to date on
what's available right now and the current street prices.

I have a 48vdc, 55AH, traction pack operating an Etek PM
motor on my converted 1976 Kawasaki KZ400 motorcycle. My
pack is on its way out and in need of replacement. As y'all
are aware lead has gone up in recent years. I originally
paid about $80 per battery three and a half years ago and
now a replacement is $150!

At that price I'm seriously considering other technologies.
I've been looking and attempting to price some alternative
batteries. I've looked a some Saft stuff for aircraft and
standby power supplies, flooded Ni-Cads, Lithium developer's
kits from A123, Ping's lithium on eBay, and a couple of others.

I'd like to keep my on board charges which are 2 Chargetek
CT500s. Each is a three-stage charger with two isolated
12vdc outputs rated at 2.5 amps. So, as you can see I'll be
charging my new pack at a slow rate hopefully negating the
need for a BMS on the more advanced packs.

Anyone care to weigh in on what you think would give me the
most bang for the buck?

Thanks!
Bob Tregilus
http://ElectricNevada.org

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#2 ·
>Ping's lithium on eBay, and a couple of others.

I've heard a lot about these, but never seen them, that I know of.

What's the link to his batts on ebay?

Thanks,
Brian


Bob Tregilus <xxx@xxx.xxx> wrote:
> Hi EVeryone!
>
> I don't follow this list real close and I realize many of
> the discussions here are related to the various battery
> technologies both old and new. Hence, I'm not up to date on
> what's available right now and the current street prices.
>
> I have a 48vdc, 55AH, traction pack operating an Etek PM
> motor on my converted 1976 Kawasaki KZ400 motorcycle. My
> pack is on its way out and in need of replacement. As y'all
> are aware lead has gone up in recent years. I originally
> paid about $80 per battery three and a half years ago and
> now a replacement is $150!
>
> At that price I'm seriously considering other technologies.
> I've been looking and attempting to price some alternative
> batteries. I've looked a some Saft stuff for aircraft and
> standby power supplies, flooded Ni-Cads, Lithium developer's
> kits from A123, Ping's lithium on eBay, and a couple of others.
>
> I'd like to keep my on board charges which are 2 Chargetek
> CT500s. Each is a three-stage charger with two isolated
> 12vdc outputs rated at 2.5 amps. So, as you can see I'll be
> charging my new pack at a slow rate hopefully negating the
> need for a BMS on the more advanced packs.
>
> Anyone care to weigh in on what you think would give me the
> most bang for the buck?
>
> Thanks!
> Bob Tregilus
> http://ElectricNevada.org
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>



--
Brian in TX
http://www.austinev.org/evalbum/960
http://www.evdub.blogspot.com/
It may seem like I am doing nothing, but on a cellular level I'm
really quite busy.

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#3 ·
> Message: 1
> Date: Fri, 23 May 2008 10:28:27 -0500
> From: "Brian Pikkula" <pikkula.xxx@xxx.xxx>
> Subject: Re: [EVDL] Best bang for the buck battery
> To: "Electric Vehicle Discussion List" <xxx@xxx.xxx.edu>
> Message-ID:
> <xxx@xxx.xxxl.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
>> Ping's lithium on eBay, and a couple of others.
>
> I've heard a lot about these, but never seen them, that I know of.
>
> What's the link to his batts on ebay?
>
> Thanks,
> Brian
>

Brian it's: http://stores.ebay.com/PingBattery

Also, he replied to an email I sent as follows:

Hi Pingping227 -

I have an application where I could use 2 - 48V 20AH LiFePO4
batteries (in parallel for a total of 40AH) in an electric
motorcycle using an Etek motor. The maximum - momentary -
current draw is around 160 amps. Continuous current draw is
around 30 - 55 amps.

1.) Do you think your batteries on eBay would work in my
application?

2.) Is it the battery monitoring system (BMS) that limits
the current draw?

3.) Can I remove the BMS in my application?

4.) If I bought 2 batteries is there any savings on the
shipping costs?

Thanks!

Be well,
Bob Tregilus
in Reno, NV USA

-

Dear Bob,

Hi Bob, For our current products, we don't recommend use
them in series or in parallel. If you want to use them in
parallel, you should add diodes to avoid current between 2
packs. 1) 160amps is too high. 2) yes, the BMS limits the
current, 2C max. 3) You could remove it, but will avoid the
warranty. 4) yes, you could save some shipping cost if buy 2
packs. However, recently EMS has stopped shipping batteries.
So, now we have to commute to UPS for shipping. They charge
higher cost. Any questions, please feel free to contact me.
Best regards, Ping






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#4 ·
Users in the electric assist bike forums have a lot of praise for Ping.
I've seen many claims of a good product, good service, and honest
dealing. Of course that's just hearsay from my POV, but you can go look
in those forums. He continually claims that his batteries are no good
in an EV, which is a good sign. Perhaps in the future he'll have some
that will be EV-worthy.

>>> Ping's lithium on eBay, and a couple of others.
>>>
>> I've heard a lot about these, but never seen them, that I know of.
>>
>> What's the link to his batts on ebay?
>>
>> Thanks,
>> Brian
>>
>>
>
> Brian it's: http://stores.ebay.com/PingBattery
>

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