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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Battery Voltage vs Charge state
04-06-2009 01:04 AM  9 years agoPost 1
aramsdell

rrApprentice

Sanford, Maine

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Does anyone have a chart of a lipo cells voltage at rest vs the percent of capacity it holds? IE. 4.20 = about 100% capacity and 3.76 = ?? capacity. I would like to double check my charger. It tells me when a battery is first connected that it has XXX % left. That number is never correct when figuring all the numbers after charging. I would like to be able to put a meter on the pack, and if it is balanced, and be able to tell how much capacity is there/used.

Should've bought a sim. Got a bucket of used blades!

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04-06-2009 03:10 PM  9 years agoPost 2
JuanRodriguez

rrProfessor

The Villages, Florida

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aramsdell,
I don't believe there is any such thing (chart, that is)....... Measuring the voltage of a battery "at rest" is useless....... For example, you can measure 12 v on an automotive battery with a voltmeter but the battery can be deader than a door nail and won't have the capacity to start the vehicle.....

Battery votage needs to be checked under a load...... for example, the "no fly" voltage of a Duralite LiOn pack is 6.9 volts under a 1 amp load.......

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04-06-2009 03:15 PM  9 years agoPost 3
Darren Lee

rrElite Veteran

Woodstock, GA

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Does anyone have a chart of a lipo cells voltage at rest vs the percent of capacity it holds?
What you are referring to is called a "fuel table" by FMA. The problem is that different brands/types of lipos have different fuel tables. That's why the Cellpro 4s and 10S "fuel" readings are typically inaccurate.

The new Multi4 charger allows user-defined fuel tables.

http://www.fmadirect.com/new_applications/multi4.html

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