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Old Oct 27, 2004, 12:17 AM
CSI
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Del Rio Intl, Texas, United States
Joined Feb 2004
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Please help with doing Battery C rating math

I admit, some math stuff drives me bonkers. I just copied down a whole lot of stuff from the battery forums trying to educate myself.
I use a bunch of 8C rated lipos.
1200mAh 2-cell
1500mAh 2-cell
1500mAh 3-cell

What is the formula for figuring out the amps I can use on these packs? They are all 8C rated and I feel I have pushed a few a little too far.
Any help is greatly appreciated.
Thanks,
Ken
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Old Oct 27, 2004, 12:33 AM
n00b
Beavercreek, Ohio
Joined Sep 2004
164 Posts
if your using 1500mah 3c lipo at 8c discharge the max amp u can use woudl be 8 x 1.5 = 12 amps. How we get that 8 (8c) x 1.5 (1500mah) = 12amps
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Old Oct 27, 2004, 12:36 AM
n00b
Beavercreek, Ohio
Joined Sep 2004
164 Posts
1200mAh 2-cell = 9.6amp
1500mAh 2-cell = 12amp
1500mAh 3-cell = 12 amp


if i made a mistake, some1 will correct. I think I did it correctly tho =/
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Old Oct 27, 2004, 12:54 AM
CSI
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Del Rio Intl, Texas, United States
Joined Feb 2004
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Thank you very much Sean. I understand the formula you used. According to your data my batteries should be fine.
We were concerned because we are flying our Yard Sticks with GWS 350/c gears using the 1200mAh 2 cell lipos. We noticed during our last few flights that our flight times were decreasing a good bit. The last time I checked with the Whattmeter, we were only pulling about 8amps static. After flying our motors are not too hot, the batteries are fairly warm...almost hot. Power is real good, but flight times are down.
Any comments are greatly appreciated. BTW...we use the same batteries in our GWS warbirds (1500 2 cell) pulling 7.6amps static.
Thanks again Sean,
Ken
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