Rocker Posted August 7, 2023 Share Posted August 7, 2023 Anyone tell if one of my lipo is dead It charges up to about 90% (5 cells at 4.1and one cell at 4.2 ).The charger drops to 00.00 and it does not say fully charged but just will not fully charged the lipo .In the end the charger indicates "Out of time " I can put it back on charge but it just goes to 00.00 charge Anyone tell me whatvis going on .The resitance on all 6 c is 4 or 5 ???? Quote Link to comment Share on other sites More sharing options...
PeterF Posted August 7, 2023 Share Posted August 7, 2023 Can your charger do a balance without charging. If it can it will bring the high cell down to the same voltage as the others. Then discharge to storage voltage 3.85V per cell. If the odd cell goes back out of balance then it has probably reached end of useful life. If all cells remain reasonably well balanced at storage voltage then charge back up again and watch the voltage during the charge. 1 Quote Link to comment Share on other sites More sharing options...
Rocker Posted August 7, 2023 Author Share Posted August 7, 2023 Thanks Peter ,will do Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted August 7, 2023 Share Posted August 7, 2023 Do watch out for some resistance in the balance plug and socket. You are looking at tiny voltage differences, 0.01V. In such a case as yours I have found that just wiggling the balance plug in its socket suddenly causes the charged to stop showing "full" and 4.20 on all cells. The LiPo is fully charged it is just the charger doesn't recognise it. 1 Quote Link to comment Share on other sites More sharing options...
PeterF Posted August 7, 2023 Share Posted August 7, 2023 25 minutes ago, Simon Chaddock said: Do watch out for some resistance in the balance plug and socket. You are looking at tiny voltage differences, 0.01V. In such a case as yours I have found that just wiggling the balance plug in its socket suddenly causes the charged to stop showing "full" and 4.20 on all cells. The LiPo is fully charged it is just the charger doesn't recognise it. Good point, if you have another measurement device check the battery with this as well as a cross check. I am currently looking into a battery with an odd cell and the cross check confirmed the imbalance was not due to the charger balance leads. Quote Link to comment Share on other sites More sharing options...
Rocker Posted August 8, 2023 Author Share Posted August 8, 2023 I did what Peter said. I discarged the battery to 14% .Then balanced it and all the cell came back and then fully charge the battery and it is all OK now Thanks 2 Quote Link to comment Share on other sites More sharing options...
MattyB Posted August 8, 2023 Share Posted August 8, 2023 1 hour ago, Rocker said: I did what Peter said. I discarged the battery to 14% .Then balanced it and all the cell came back and then fully charge the battery and it is all OK now Thanks 14%? That is pretty low. Instead of percentages, always discharge to a target V/cell - 3.2-3.3V/cell should be your target range, that leaves some safety margin if you make an error or temps are low. 1 Quote Link to comment Share on other sites More sharing options...
MattyB Posted August 8, 2023 Share Posted August 8, 2023 PS - Continue to keep an eye on that pack, as if it's gone out of balance once, it is more likely to do so again in the near future. Certainly never charge it in parallel with other packs unless you are happy all cells are in balance at the start point (and all cell voltages are within 0.1V of each other across ll the packs being parallel charged). Quote Link to comment Share on other sites More sharing options...
Flying Squirrel Posted August 8, 2023 Share Posted August 8, 2023 3 hours ago, Rocker said: I did what Peter said. I discarged the battery to 14% .Then balanced it and all the cell came back and then fully charge the battery and it is all OK now Thanks Just an observation - Myself and other club members with generic type lipo testers have noted that they often read 14%, far more than coincidence could explain, almost as if 14% covers anything from 10%-25% 1 1 Quote Link to comment Share on other sites More sharing options...
RottenRow Posted August 8, 2023 Share Posted August 8, 2023 37 minutes ago, Flying Squirrel said: Just an observation - Myself and other club members with generic type lipo testers have noted that they often read 14%, far more than coincidence could explain, almost as if 14% covers anything from 10%-25% Ha ha, this is a running joke between myself and a fellow club mate! It doesn't happen with the 'original' version of those little black testers.. the ones branded 'Fusion Smart Guard' seem much more accurate. The others (I've seen several slightly different versions) all seem to be named 'Capacity Controller'; I've no idea how they control anything! One that I had also showed a battery cell imbalance on the same cell in a number of packs, but only on a cold day. Clearly one or more sensitive components inside that one. It is no more, courtesy of a hammer. The most accurate way to check individual cells would be to use a single voltmeter and read each cell in turn (at the balance plug). I do this occasionally just to check that my balance charger is indeed balancing the cells correctly. Brian. 2 1 Quote Link to comment Share on other sites More sharing options...
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