lipo question
 

hi guys this is probably a dumb question but anyway

say you have a lipo that is

7.4 v 5000 mah 25c and 30@bursts

so is that a discharge @ 5x25 = 125amps
and at the bursts 5x30 = 150amps
is this correct

so if you run 2 of these in series does it then double

as in 2x 5x 25 =250amps
or am i completly off the rails with this one


if you have a high discharge rate say 125amp
but only a 100 amp esc would this cause the esc to cook its internals

when you run in series the only thing that changes is the voltage, capacity changes when run in parallel, and the moyor will only draw the amprage that is needed

ok that answers that cheers mate

but what if you have a 14.8 v 100 amp esc
and run a
14.8 v 25c 5000mah lipo

5amp x 25 = 125amps and thats without bursts of 30c

would this hurt the esc as the esc is only 100 amp

it depends on what the motor is asking for.....if the motor is asking for as lot of amps that is whats going to happen..this will happen especially with a lower turn motor

when you say lower turn motor do you mean a lower kv rating

will a lower kv draw more power than a higher kv

no its the opposite...lower turn = higher KV...and a higher turn motor will draw more amps, there is less wire in the winding so there is less resistance for the electricity to turn the rotor

azjc - I think you got the last bit the wrong ways around.

lower turn = higher KV - Equivalent gearing higher KV will draw more amps

You can see in chart below:

http://img.diytrade.com/cdimg/85838/...1082223033.jpg

The only thing a battery "pushes" is voltage. It's common to have people think that a battery will "push" the current it's rated for. However, the motor decides how current it needs to get the job done and pulls only what is needed. Makes sense too, because if that 5Ah battery pushed 125A, it would only last 2.4 minutes. :smile:

Just think of electricity as water. Voltage is like water pressure, resistance is like a restriction in a water hose, and current is how fast the water is going. A battery is kinda like a large tank of water. It will only hold so much water until it is depleted. And the flow is determined by the amount of water pressure and restriction of the hose. It's not a perfect analogy, but it's close enough to help people visualize.