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Under Load Battery Voltage Testing

Started by Bill Bradford, April 10, 2019, 10:45:17 AM

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Bill Bradford

I have a Futaba BR-3000 meter for testing my receiver batteries. However, I recently discovered that it does not test the battery with a load on it after I compared it to a receiver switch that had voltage level lights. While the Futaba tester showed 99% capacity remaining, the receiver switch showed red, a level indicating a very low voltage. This was proved correct when I tried to move the servos and they were very sluggish. I charged the battery and the switch showed green and I had normal servo function. I researched the Futaba meter and found out that it does indeed test without a load.

I plan to put a resistor in series with the tester leads in order to test the 6 volt battery under load. In order to produce an approximately 1 to 2 amp load, I will use a 5 ohm resistor. Does this make sense to you guys?


Bill Bradford

Steve Rogers

Make sure you have a 5 or 10 Watt resistor. It will get hot.
Signed: Steve Rogers (As far as you know)
Nothing is foolproof to a sufficiently talented fool.
For Herb: All facts have not been personally verified by me for accuracy. Use them at your own risk.

Bill Bradford

Thanks, Steve. I plan to use a 10 watt resistor.