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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Charge & Checking battery through a switch?
11-11-2005 03:32 AM  14 years ago
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leetony

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Irvine, CA

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Charge & Checking battery through a switch?
Hi,
I was checking my battery tonight with the Futaba voltage checker w/load, I found that checking the battery through the swtich was about 0.2 volts lower than checking directly to the battery. Out in the field, do you check through the swtich or direct to the battery? How about charging the battery, would the voltage differece cause a false peak or incomplete charge? I'm using a Sirius Quad charger.
Thanks,
Tony
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11-11-2005 04:34 AM  14 years ago
Tristan Buhler

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SLC, Utah

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i have had this problem. For me it meant the switch was ready to die. I could twiddle with the switch a little and the voltage would change. I got a new switch and now it reads the same with and w/o it. I am not saying your switch could be bad but this is what happened to me.Tristan Buhler.
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11-11-2005 05:32 AM  14 years ago
rplumbo

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St. Paul, MN

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This is partly to what's called "contact resistance" in the switch. If you look at any spec sheet for a switch, this will be listed. There's also resistance in the wires, solder joints, connectors etc. All these resistances are adding up, and causing a larger voltage drop.
V = Current * Resistance

Peak detection is just that...peak detection. In the old days, this would be done by a series of OpAmps that would detect when the slope of the Voltage Vs. Time curve went negative and shut off your charge. Peak cutoff is a function of the shape of the slope, not the value.

Check it through whatever's easiest.

Reid
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11-11-2005 06:13 AM  14 years ago
leetony

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Irvine, CA

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Thanks for the help.
Thanks for the help.
Tony.
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11-11-2005 06:52 AM  14 years ago
gkoutsis

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Athens Greece

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After seeing and reading numerous problems with switches failing, I decided to completely remove mine and use Dean's instead.George
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11-12-2005 03:32 AM  14 years ago
sed6

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OKC, OK

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Be aware of the Futaba voltage checker, it only checks at 750mAh. This is contrary to what many believe. A 750 mAh load may of may not be enough to accurately gauge you battery reliability.
-------------------
-Scott D
T-Rex 600N
T-Rex 450SA

Practice at the field!
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