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Old 10-22-2003, 04:26 PM   #1036
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Dan, I'll have to come by and see you and Randy. I think there's going to be a lot of us there running Fuku's.
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Old 10-22-2003, 04:27 PM   #1037
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I'll have my 1850 watt there if anybody needs, I just ask that you chip in for da gas
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Old 10-22-2003, 04:29 PM   #1038
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Default Re: Diffent Cell, Different Temperature reading

Quote:
Originally posted by Jasonchi
What does the difference in cell temperature telling me? are the hotter cells means it's dying and need to be replaced?
As I've mentioned elsewhere, the nature of NiMH charging is that it's exothermic, meaning the charge reaction (really the discharge reaction driven in reverse) generates heat. The amount of heat is directly proportional to two things: the charge current and the nearness of the cell to charge completion. When the cells near the end of their charge, they heat up faster, causing the temperature rise we see as the end-of-cycle inidcation. By their nature, some cells will charge a little faster or slower than their neighbors, even if they're matched very closely.

That said, a difference of a few degrees isn't enough to worry about when charging.

-dave
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Old 10-22-2003, 05:10 PM   #1039
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Discharging the pack on a try will help that problem (one cell being hotter than the others) The cells that are getting hot are probably starting the charge cycle with more power in them, so they are getting done quicker.
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Old 10-22-2003, 05:45 PM   #1040
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Quote:
Originally posted by Maj. Teeth
Hi Bubbles,

you do realize that it only took one day right?

Dan
Yes, I do relize this...

Free shiping, only one day to get here, GREAT numbers...
What else could one want...?

Thanks guys!
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Old 10-22-2003, 06:14 PM   #1041
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Default Re: Re: Re: Re: Toyota/Lexus Race

Quote:
Originally posted by holycow
U gona be there Dan? Ill swing by and introduce myself.
Yes, please swing on by and grab a bottle of pure refreshing water. I "might" bring gourmet coffee too.

Dan
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Old 10-22-2003, 06:16 PM   #1042
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Quote:
Originally posted by rtypec
Hey Dan, since you're going to bring your portable nuclear powerplant. If we're short on power, can we plug an extension chord into yours? Fukuyama Portable Power Racing!
You "might" be able to. the 2000watt honda will put our about 16.7 amps continuously and I've got two chargers going and a soldering iron. Might have to switch off one charger or you are always welcome to one of the charger although you don't run any Fukuyama, I'll still make that an exception. LOL

Dan
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Old 10-22-2003, 06:17 PM   #1043
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Quote:
Originally posted by jkerr0043
Dan, I'll have to come by and see you and Randy. I think there's going to be a lot of us there running Fuku's.
I'd be truly honored to meet you in real person. Come, chat and become a buddy!

Dan
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Old 10-22-2003, 06:17 PM   #1044
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Quote:
Originally posted by holycow
I'll have my 1850 watt there if anybody needs, I just ask that you chip in for da gas
Well, I might have to ask you to reserve a plug for me too in case I dont' have enough. I'll donate the gas if so.

Dan
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Old 10-22-2003, 06:20 PM   #1045
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I took a couple of older UNMATCHED packs I had that have verry similar #s for the pack. Both were discharged after racing to .9 v per cell. One I charged back up and the other one I put on a tray and took way down to .7 volts per cell. These were 4 cell packs, not that it matters.

I charged them both 5.5 amps, 5 mv per cell threshold. Of course the deep discharged one took longer to charge. After sitting for 2 days, I repeaked them both twice and did a discharge test.

The pack that was just charged up had an average PACK voltage of 4.63 (1.1575/cell) with a time of 532 seconds AT TWENTY AMPS RATE.

The one I took down deep had an average voltage of 4.66 (1.165/cell) and 501 seconds at TWENTY AMPS.

Only a small gain in voltage with a bigger loss in run time. Just a gain of .03 volts for the whole pack.

The pack I took down deep ended its cycle almost instantly. The graph went right from east to south. The other pack that was just charged back up without traying made more of a curve and a little more gradual drop at the last 20 seconds.

Just an observation to share about taking care of cells. This reinforces what I have read here.

David Root

These were NOT FU Batteries.
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Old 10-22-2003, 08:02 PM   #1046
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hey guys
you are giving some great info about the new gen cells. my question is for the first gen cells. i have two 6 cell packs from about a year ago. they are matched gp 3300 but not fukuyama. when charging these packs, what temps should i be looking for. they peak at about 9.25 5 a charge. when i bought the packs, the norm was about 110 to 120 f . has that changed to the higher numbers that the new gen sees like 140? also if i use a gun where should i take the readings, on the sides by the bars or on the curve? should i use the charge / discharge methods listed for the new cells? any info will be helpful.
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Old 10-22-2003, 09:53 PM   #1047
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Dan-

YGPM.....please check asap!

Buddha
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Old 10-22-2003, 10:52 PM   #1048
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Quote:
Originally posted by Maj. Teeth
Well, I might have to ask you to reserve a plug for me too in case I dont' have enough. I'll donate the gas if so.

Dan
Dang Dan, how much stuff do you plan on running???
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Old 10-22-2003, 10:55 PM   #1049
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Quote:
Originally posted by Randman
Dang Dan, how much stuff do you plan on running???
Well I'm plugging in off him too. Right Dan
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Old 10-22-2003, 11:47 PM   #1050
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Hi, guys! Been reading on your success and wondering where does your cells comes from. I'd been reading about those cells with "SCHCR" codes being said to be specifically made for RC racing applications. I plan on getting some of your 1.17s but after I seeing your cells having "SCHC" code, I would like to ask you guys first about these two different codes. Can you shed some light on how true is this story?

Thanks
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