danpamm

Does anyone know how to calculate the c rating of a battery need for a certain motor? I am using a rimfire 400. I dont think i am toping 15 amps and i am using a 3s 1000 mah lipo. I have others and dont want to get too low c rating for my battery.

guver

My Feedback: (325)

The calc is : current divided by capacity = the rating.

danpamm

Any chance you know how to calculate the battery c rate that is needed for the current draw or am i not understanding. Its been 30 years since i did any of this. I dont want to but a 15 c battery and explode it or ruin it.

guver

My Feedback: (325)

That is what I posted. Current /capacity=rating

15 amps / 1ah = 15C

BarracudaHockey

My Feedback: (11)

1000 mah X C rating (lets use 20 as most batteries these days are atleast 20) / 1000 = continous amps

1000 x 20 = 20000 / 1000 to convert mah to amps = 20 amps.

Since you feel that 15 amps is going to be your draw a 20c battery would be fine.

1000x 15 = 15000 / 1000 = 15amps no overhead so I would say 20c is what you need.

Remember to be a bit conservative, as C ratings are often more marketing than fact and its cheaper to get a higher C rating than to replace a puffed battery.

aeajr

My Feedback: (2)

As stated above you back into the C rating you need based on the amps you need to deliver AND the duration you are trying to achieve.