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Battery question

Joined
May 21, 2020
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England - Southwold Suffolk
No expert in battery tech, I have a four cell battery's I conducted two tests

This was done on a battery that is in storage "mode"

Battery starting cell 1 = 3.81v, 3.82v, 3.82v, and 3.82v
Battery resistance cell 1 - 005, 006, 007 ,008 Ohm's

Why are the resistance no the same or is that normal
 
The measured by your resistance highly depends on the contact resistance of the overall circuit. Connect and disconnect connectors a few times and you'll get different results. More than that, not current loaded voltage and internal resistance aren't hard-tied values.
 
The measured by your resistance highly depends on the contact resistance of the overall circuit. Connect and disconnect connectors a few times and you'll get different results. More than that, not current loaded voltage and internal resistance aren't hard-tied values.
Thank you, tried what you said and there are changes
 
These are some batteries I have checked. The ones on the right are in good condition.
The ones on the left are not great and would have shorter flight times.
 

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The most dangerous thing about the high internal resistance batteries is not a shorter flight time but unpredictable behavior in forced maneuvers, especially fast prolonged climbs. In this mode, the copter gets a lot of power and measured voltage can activate an alert on the ST, or worse, RTH. In smooth flights, the voltage drop is almost linear and predictable. So, when you get a first low voltage alert, stay calm and don't do high-rated maneuvers.
 
The most dangerous thing about the high internal resistance batteries is not a shorter flight time but unpredictable behavior in forced maneuvers, especially fast prolonged climbs. In this mode, the copter gets a lot of power and measured voltage can activate an alert on the ST, or worse, RTH. In smooth flights, the voltage drop is almost linear and predictable. So, when you get a first low voltage alert, stay calm and don't do high-rated maneuvers.
Excellent advise Vaklin thank you
 
It may not be necessary to dispose of a battery with higher resistance measurements. As long as the battery is not showing signs of swelling, it can still be used for non-flight operations... calibrations, GPS almanac downloading and software updates, are some examples. 👍
 

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