Battery run time
02-09-2011, 07:42 PM
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RE: Battery run time
Thats a hard question to answer, but in short, NO would be the correct answer. The C rating, voltage and all that have a slight effect on run time.
Eric
Eric
02-10-2011, 04:23 AM
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RE: Battery run time
the mah will give you an ideal of the runtime more than the voltages ie 11.1 will be more powerful than the 7.4v one but like others have said it depends on the c rating on some packs and how there used etc
02-10-2011, 06:53 AM
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RE: Battery run time
Sorry, but it's NOT a hard question to answer.
The answer is NO not every battery of a given mAh rating will have the same run times. In fact, it would be far more unusual to find batterys that have the exact same run time than ones that don't.
And the reasons are many. The composition/quality of the lithium, the composition of the polymer seperator, the size/shape of the anode and cathode, The internal resisteance of the individual battery, the welds to the wiring and the wiring itself all contribute to giving each cell individual charicteristics. Then when you start combining cells to make multi-cell packs you start adding to the losses with the addational wiring and connections. And then there's the age of each battery/pack to consider. Like any battery, lipos have a finite life span and the older a battery gets the more it's performance will suffer.
And those are just things about the battery that will vary runtime.
Even with the same car and electronics run times of the same battery can vary. Heat up the ESC/motor and efficency can drop causing lower run times. And obviously driving style/surface, conditions, etc will all effect runtime of any given battery.
The answer is NO not every battery of a given mAh rating will have the same run times. In fact, it would be far more unusual to find batterys that have the exact same run time than ones that don't.
And the reasons are many. The composition/quality of the lithium, the composition of the polymer seperator, the size/shape of the anode and cathode, The internal resisteance of the individual battery, the welds to the wiring and the wiring itself all contribute to giving each cell individual charicteristics. Then when you start combining cells to make multi-cell packs you start adding to the losses with the addational wiring and connections. And then there's the age of each battery/pack to consider. Like any battery, lipos have a finite life span and the older a battery gets the more it's performance will suffer.
And those are just things about the battery that will vary runtime.
Even with the same car and electronics run times of the same battery can vary. Heat up the ESC/motor and efficency can drop causing lower run times. And obviously driving style/surface, conditions, etc will all effect runtime of any given battery.
02-10-2011, 07:02 AM
#6
RE: Battery run time
the "C" rating plays a big part.
a 40 C 4000mah might actually get longer runtimes than a 20 C 5000mah.
the lower the "C" rating, the harder the batt will have to work to power the motor. the greater the strain, the lower the runtime.
and as with most things, not every battery is given a "true" rating.
a 40 C 4000mah might actually get longer runtimes than a 20 C 5000mah.
the lower the "C" rating, the harder the batt will have to work to power the motor. the greater the strain, the lower the runtime.
and as with most things, not every battery is given a "true" rating.
