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Battery management question

Battery management question

Old 12-03-2003, 08:51 PM
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Originally posted by Maj. Teeth
I'm a little in disagreement with the bringing down below .9volts part. We're experiencing some gain in runtime but it is to be determined. So far we've brought the cells down to about .05 and hold it there for 5 minutes before charging them right away and it has yield a higher charge and peak with better runtime. Just something we're working on.

Dan
forgot to ask... how do you hold it down to .05 volts for 5 mins?
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Old 12-03-2003, 11:19 PM
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Originally posted by highwayman
forgot to ask... how do you hold it down to .05 volts for 5 mins?
Yeah, since it's in the testing stages, we've built our own discharger board with resistors and diodes. The packs are left on the tray for a period of 5 minutes before we take it and charge it.

Dan
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Old 12-03-2003, 11:45 PM
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The reason we use a 0.9v as cutoff ultimately it's because we don't want the cell to go down to zero volt. If you look at the discharge curve, say on a GFX then you will observe that the majority of the discharge process occurs in the middle portion where the voltage drops slowly. Just before or at 0.9v the relatively flat curve will bend into a very steep plunge, touching 0 volt could be only a matter of seconds. AND YOU DON'T WANT YOUR CELLS TO GO TO ZERO unless you have sound experience with this.
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Old 12-04-2003, 12:23 AM
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Hi all,
just wondering does anyone equalize the cells before sec charge of a day?
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Old 12-04-2003, 05:33 AM
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I generally do not tray a second time. Once they're equalized the first time than I discharge and while checking with a volt meter, they stay equalized throughout a race day. I only equalize once
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Old 12-15-2003, 07:55 PM
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What will happen if I don't get to discharge my batteries for a couple of days after I have used them? Due to a malfunction with my discharger, I haven't been able to discharge them yet. I don't plan on using them again til after christmas.

Thanks
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Old 12-15-2003, 08:34 PM
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Originally posted by BigRon
What will happen if I don't get to discharge my batteries for a couple of days after I have used them? Due to a malfunction with my discharger, I haven't been able to discharge them yet. I don't plan on using them again til after christmas.

Thanks
A friendly suggestion from me would be to hurry up and find a discharger. This is one of the ways to loose heaps of runtime very quickly if you haven't already.

Dan
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Old 12-15-2003, 10:44 PM
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Originally posted by DanDan
Hi all,
just wondering does anyone equalize the cells before sec charge of a day?
i discharge and equalize to .9 volts after each run.
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Old 12-17-2003, 05:57 PM
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1 generally only run each of my race packs 1 time per race day, i always discharge completely and tray them

seems to work good, my packs usually last a long time and seem to preform well utill the end
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