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<blockquote data-quote="RotorWash" data-source="post: 115649" data-attributes="member: 18210"><p>Your voltages seem within normal range. I have four batts and there is always one cell (usually #3) that is a little different than the other two. A little difference is ok but more than 0.07v and it may be time to get concerned. Some info from <a href="https://airdata.com/" target="_blank">AirData</a> about cell deviations:</p><p></p><p><span style="color: rgb(41, 105, 176)"><em>Minor Deviations</em></span></p><p><span style="color: rgb(41, 105, 176)"><em>Minor deviation is when a cell differs more than 0.01v from the other cells. The total amount of deviations per cell is then divided by the total amount of flight minutes, to get the number of minor deviations per minute. </em></span></p><p><span style="color: rgb(41, 105, 176)"><em></em></span></p><p><span style="color: rgb(41, 105, 176)"><em>Note that even a perfect battery would have minor deviations and it is normal. Lower values are better. Higher values may provide an early sign that the battery is not as efficient. </em></span></p><p><span style="color: rgb(41, 105, 176)"><em></em></span></p><p><span style="color: rgb(41, 105, 176)"><em>Major Deviations</em></span></p><p><span style="color: rgb(41, 105, 176)"><em>Major deviation is when a cell differs more than 0.07v from the other cells. Please note that normal batteries can have a few of these.</em></span></p><p><span style="color: rgb(41, 105, 176)"><em></em></span></p><p><span style="color: rgb(41, 105, 176)"><em>An abnormal battery will:</em></span></p><p><span style="color: rgb(41, 105, 176)"><em> A) Have most of the major deviations in one cell</em></span></p><p><span style="color: rgb(41, 105, 176)"><em> B) There will be multiple major deviations per minute, and more than 10 total</em></span></p><p><span style="color: rgb(41, 105, 176)"><em> C) The deviations continue longer than 1 minute</em></span></p><p><span style="color: rgb(41, 105, 176)"><em></em></span></p><p><span style="color: rgb(41, 105, 176)"><em>If your battery shows all symptoms then this is considered a more severe case of an inefficient battery and may impact the battery life.</em></span></p><p><span style="color: rgb(41, 105, 176)"><em></em></span></p><p><span style="color: rgb(41, 105, 176)"><em>If your battery has only 1-4 instances on the same cell, don't worry too much about it. If it has 5-10 instances - then continue to track and make sure it does not degrade.</em></span></p><p></p><p>Here's a cell graph from one of my recent flights:</p><p></p><p>[ATTACH=full]13177[/ATTACH]</p><p></p><p>One final note, cold weather usually makes a cell deviation worse so extra precaution is always advised.</p></blockquote><p></p>
[QUOTE="RotorWash, post: 115649, member: 18210"] Your voltages seem within normal range. I have four batts and there is always one cell (usually #3) that is a little different than the other two. A little difference is ok but more than 0.07v and it may be time to get concerned. Some info from [URL='https://airdata.com/']AirData[/URL] about cell deviations: [COLOR=rgb(41, 105, 176)][I]Minor Deviations Minor deviation is when a cell differs more than 0.01v from the other cells. The total amount of deviations per cell is then divided by the total amount of flight minutes, to get the number of minor deviations per minute. Note that even a perfect battery would have minor deviations and it is normal. Lower values are better. Higher values may provide an early sign that the battery is not as efficient. Major Deviations Major deviation is when a cell differs more than 0.07v from the other cells. Please note that normal batteries can have a few of these. An abnormal battery will: A) Have most of the major deviations in one cell B) There will be multiple major deviations per minute, and more than 10 total C) The deviations continue longer than 1 minute If your battery shows all symptoms then this is considered a more severe case of an inefficient battery and may impact the battery life. If your battery has only 1-4 instances on the same cell, don't worry too much about it. If it has 5-10 instances - then continue to track and make sure it does not degrade.[/I][/COLOR] Here's a cell graph from one of my recent flights: [ATTACH type="full"]13177[/ATTACH] One final note, cold weather usually makes a cell deviation worse so extra precaution is always advised. [/QUOTE]
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