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#1
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Internal resistance in lipos
I have three packs of Nvision 7200 100c 1 cell lipos I use in my gt12, all about 6 months old and used in rotation so similar usage
When charging them on an Orion advantage touch pro I get IR figures of 2.1, 3.8 and 5.2 for the three packs - m and symbol I cannot get on my keyboard. I appreciate the actual figure is probably fairly meaningless unless the charger has been accurately calibarated but does anyone have any idea if these differences are big enough to actually make a noticeable difference? I feel like the one with the highest IR is the worst performing but not sure if it is all in my head... Rob
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____________________________ Rob Warren Yokomo Cal3.1 Yokomo YZ4 SF2 |
#2
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It acts as a little resistor as it suggests.
If you pull current through a resistance, you get a voltage drop. The higher the resistance the more voltage drop you get. For say 20A discharge current on your 3 packs: V drop = 20 x 0.0021 = 0.042V V drop = 20 x 0.0038 = 0.076V V drop = 20 x 0.0052 = 0.104V So it makes a difference, but if you will notice it is debatable to be honest. G
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Graham North http://www.atomic-carbon.co.uk https://www.facebook.com/atomiccarbon https://www.facebook.com/nortechracing |
#3
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Thanks for the simple explanation, Graham, even I understand that
Given how close it can get in gt12 and limited power, think it is probably enough of a difference to bother to use the highest ir in practice and lowest in last round of qualifying. Rob
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____________________________ Rob Warren Yokomo Cal3.1 Yokomo YZ4 SF2 |
#4
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Just jot the IR down on a sticky label on the battery. See if you can notice a difference next time you drive. Or use the lowest IR pack as "best".
It's not likely to make a noticeable difference. But. Marginal gains and all that....... |
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