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Old Mar 04, 2012, 01:00 PM
jasper7821 is offline
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Battery discharge question. How long will my battery last

I'm fairly new to electric flying.
I have my quadcopter FPV setup and wondering what size battery I need to last for maybe 2-3 charges so about 30 minutes total and still have the suggested charge left in the Lipo

My 5.8 TX and camera draws a total of 310mah.
I do not know the formula to see what the smallest 3S size battery to use to make it last 30 minutes.

I have an extra 3S 2200mah that weights 165 grams but I'd like to be light as possible. I see on Hobby King that a 1000mah 15c weights 109 grams.

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Old Mar 04, 2012, 01:38 PM
ggcrandall1 is offline
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First of all you have to know how much current you quadcopter draws in flight. This can be determined with a wattmeter. Then it is a mater of calculating how much current you need to fly 30 minutes.

Old Mar 04, 2012, 01:49 PM
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You're not very clear. Do you mean you are using a separate battery for the FPV Tx and camera and it's that you want to last for 30 minutes ? Which I'm guessing is 2 or 3 charges of the main power battery ?

If so then it's pretty simple. mAh mean milliamp hours. If you want 310mA for 1/2 hour it only needs 155mAh (half of 310 ) call it 200mAh to give you plenty to spare capacity.

Of course if you meant something else then that hasn't helped at all .

Old Mar 04, 2012, 02:45 PM
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Thank you very much, thats exactly what I needed.
Sorry for not being clear.
I have a 4s battery for my main power.
So my 2200 is way over kill than for my FPV, I'll get a smaller battery maybe like 250mah range.
Thanks again.
Last edited by jasper7821; Mar 04, 2012 at 03:09 PM.

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