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help with Peak Adj. on Batteries

help with Peak Adj. on Batteries

Old 02-11-2004, 10:04 AM
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Default help with Peak Adj. on Batteries

I have an indi 16x5 charger. As I scroll through the setup, I come across this dialog box for input: _mV/C. _mV/P. I'm a little unsure what I should enter for charging. I'm charging GP 3300 matched cells (6) for my Touring car and B4 buggy for racing. They are expensive cells, and are concidered some of the best so I don't want to screw them up or get less than optimum performance out of them. Right now I have it set for 9mV/C. 54mV/P. Is this correct and what 's really the theory behind these settings, I read the literature that came with the manual, but this part is vague. Help please.
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Old 02-11-2004, 10:13 AM
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I would set it to less than that.

With the 16x5 charger, you set the peak delta in mV per cell (mV/C on the readout), and it calculates the mV per pack (mV/P) according to how many cells you have selected to charge.

For the GP 3300's I would set the charger to 5mV/C.

The theory is basically that the cells voltage starts to drop off once it's reached a full charge, and we can use this as a sign of when to stop charging (peak charging). Larger peak delta values mean the cells stay on charge longer - but too long can damage cells.
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Old 02-11-2004, 10:22 AM
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Thanks. That makes sense. How do I find that info for different kinds of cells, or is that the standard for most 3300 packs?
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Old 02-11-2004, 10:25 AM
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Starting with 1st edition cells.
Sanyo 3000H's,Panasonic blue's,Panasonic SMH,Panasonic UMH all liked 3mv/c

Sanyo 3000HV's liked-7mv/c
Sanyo 3300's like-3mv/c

GP3300's like 5mv/c

If you decide you wanna repeak a pack due to sitting too long.
Do 1mv/c on all the cells listed above.
Hope this helps.
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Old 02-11-2004, 10:27 AM
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Thanks, but how did this list get compiled? Is it something you did by trial and error, or did you get the info from the manufacturer?
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Old 02-11-2004, 11:34 AM
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there is a list of recomended peaks for many cells in the manual...

although the manual I have does not have a recomendation for gp3300 - I found out the hard way by setting to 54mv/pack and frying some cells - now I use 30mv but need to cool the packs with a fan. Try and start out lower than 30mv to be very safe and adjust according to temperature from there...
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Old 02-11-2004, 11:51 AM
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I've been getting a good amount of false peaks with my 16x7 and GP3300s. It's been set to 3mv/c, could this be the reason for the false peaks?

Thanks,
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Old 02-11-2004, 11:58 AM
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Next time you charge a pack take a temp reading when its done. The pack should be between 135f and 150f when done. If its too cold increade the cutoff if its too warm decrease. My Quasar Pro works best at 7mv for 6cell and 5mv for 4cell. My packs are alwayse between 135 - 145. Each charger mat be a little different depending on the circuitry it uses. And cooling packs with a fan is bad. The chemicals inside the cells like to cool slowly and evenly. Packs should also be up to temp at racetime for max performance. To do this either charge just before the race starts so your charging is done within 5 min of the race starting. Or charge well before and let pack cool and repeak before the race with the same setting you originally charged with. Im not an expert but I did do my homework on how to take care of my packs, and my packs perform flawlessly every time and are as good as the day I bought them.

Last edited by Speedie; 02-11-2004 at 12:03 PM.
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Old 02-11-2004, 12:17 PM
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Thanks. I've heard of charging and taking theraml readings, makes sense so you can control how the pack is reacting. I've also heard, for best results, charge to about 2500 then store until race day, then peak them all the way up till right before the race, so they are at their peak right before the beginning? Or should I peak them and store, then repeak before race?
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Old 02-12-2004, 03:19 AM
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As far as I understand, temperature is quite important with GP cells. Now I'm racing in an environment, where temperature differs quite a lot depending on the outside weather. So I believe that getting an charger with a temperature probe would be the best?
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Old 02-12-2004, 05:13 AM
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I found that if you cool the cells during charging (use a small fan) you get a lot less false peaking. I've been using this method for more then 2 years now and hardly get a false peak.
Only trouble is if you want to check the temp of your pack after charging you won't get an accurate reading. Small price to pay i say.

Regards
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Old 02-12-2004, 06:27 AM
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how about the lrp pulsar??? it doesnt says mv/cell.. it just say mv...how much should I set for a 6c pack??? I am currently using 10mv...
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Old 02-12-2004, 07:50 AM
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The LRP charger gives you the Mv for 6 cells. Just do 3 or 4 mv x6
So for a 6 cell pack use 20 or 30 Mv
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Old 02-12-2004, 09:23 AM
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O kay. I changed it to 5m/v and set the charger to 2500 mAh for my Gp 3300 cells. When charging, they are getting way hotter than before. I'm worried. Also, even with it set for 2500 it continues to charge alll the way up to peak around 3500. I thought I could just charge up to 2500 for storage? BTW, I discharged them and equalized them on a Trinity light bump discharger, let the pack cool then charged.
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Old 02-12-2004, 09:38 AM
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That's 5mv/c so 30mv/p
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