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02-08-2008 06:47 PM  10 years agoPost 1
MMike

rrElite Veteran

Holland,Mi-USA

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Heli uses 100 mah per minute.

800 mah battery

Do I need 10C or 15C ?

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02-08-2008 07:05 PM  10 years agoPost 2
shizack

rrKey Veteran

Aiken, SC USA

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How much current does it draw? That's how you figure what "C" you need. If your motor is rated at 15 amps, a battery that can put out about 18 - 20 amps would be recommended. Servos and other electronics usually want 1 - 3A total.

A battery's amp rating is figured by multiplying mah x C.

Using your examples, the 800mah 10C could safely put out 8 amps continuously. 800ma x 10 = 8A

The 800mah 15C could safely put out 12A
800ma x 12 = 12A

All mah tells you by itself is how long it can sustain amp output.

800mah ÷ 100ma/minute = 8 minutes, regardless of "C" rating.

A soul in tension is learning to fly

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02-08-2008 11:58 PM  10 years agoPost 3
tryan02

rrProfessor

Canton, Missouri

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taken from:
http://www.rchobbies.org/lithium_ba...reakthrough.htm

like shizack said the link gives more info too.

C Rating
LiPo cells are also commonly given a C or current rating. This is the maximum average recommended discharge current for the cell. For example, the Thunder Power 1900mAh packs have a 6C rating. To determine the maximum recommended discharge rate multiply the capacity times the C rating. 1900mAh x 6C = 11,400. So the maximum recommended discharge rate would be 11,400mA or 11.4 amps. If your application has a higher amp draw, remember that LiPo cells can be wired in parallel, and with 2 cells in parallel each cell sees half the total current. With 3 cells in parallel, each cell see one third the current.

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02-09-2008 12:01 AM  10 years agoPost 4
MMike

rrElite Veteran

Holland,Mi-USA

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Thx Guys.

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02-09-2008 12:05 AM  10 years agoPost 5
tryan02

rrProfessor

Canton, Missouri

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