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Old 12-10-2017, 01:52 PM   #1 (permalink)
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Default MUI 150 mah reading

Hi guys,

I have installed a mui 150 on my Synergy E5 and am finding the reading doesm't match up with the percentage on the battery check and the charger.

On a 5000mah battery after a flights its telling me that I have consumed 3400mah (34%), but on checking with a battery checker, the battery checker shows 24%. This is backed up by the charger which shows starting fuel of around 24% and my flight logger, which calculates 24% based on mah consumed.


.
Charger shows that I can put around 3400 back into the pack.Which makes no sense whatsoever.

Any idea why there is a 10% discrepancy between the mui reading and
battery percentage calculated on the voltage?
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Old 12-10-2017, 01:58 PM   #2 (permalink)
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Quote:
Originally Posted by Argypak View Post
Hi guys,

I have installed a mui 150 on my Synergy E5 and am finding the reading doesm't match up with the percentage on the battery check and the charger.

On a 5000mah battery after a flights its telling me that I have consumed 3400mah (34%), but on checking with a battery checker, the battery checker shows 24%. This is backed up by the charger which shows starting fuel of around 24% and my flight logger, which calculates 24% based on mah consumed.


.
Charger shows that I can put around 3400 back into the pack.Which makes no sense whatsoever.

Any idea why there is a 10% discrepancy between the mui reading and
battery percentage calculated on the voltage?
Voltage is a very poor and inaccurate measure of the remaining capacity. It depends on a lot of factors like battery condition and temperature.

It can be used as an indication of the remaining capacity at best.
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Old 12-10-2017, 02:45 PM   #3 (permalink)
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Voltage is a very poor and inaccurate measure of the remaining capacity. It depends on a lot of factors like battery condition and temperature.

It can be used as an indication of the remaining capacity at best.
Yep, exactly. The battery checkers and charger % remaining are just mapping the voltage to an estimated average percentage. If the mAh out is matching the mAh in then you know it the MUI working accurately.

//Dennis.
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Old 12-10-2017, 02:49 PM   #4 (permalink)
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Yeah, don't rely on voltage, it's subject to a whole bunch of factors. What you should check is the mAh your charger says it put back into the pack. That should tally fairly closely with the amount the telemetry tells you was consumed.
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Old 12-10-2017, 04:59 PM   #5 (permalink)
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All my MUIs seem very accurate. There will be some extra electrons put in during recharge due to balancing. Dan
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Old 12-24-2017, 12:55 PM   #6 (permalink)
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Only reliable way to measure accuracy of mAh-counting sensor is to compare the sensor-shown value to mAh's you put back in to battery when charging.

No voltage checker can show you anything correct, they're based on voltage measurement, which in itself is vary inaccurate to measure charge-level and voltage tend to rise a bit after flight when battery has some time to settle.
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