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Why is my range only 2 miles on a 6s 5000 mah battery?


#1

I am running on two 3s 5000 mah batteries in series with a 149 kv turnigy motor and I only get 2 miles in range. The esc is the hobby king 150 amp esc. The voltage dropped on each individual battery from 12.6 volts to 11.4 volts. I ran it on a running track, which is obviously flat ground, and was at full throttle most of the time. I’d imagine top speed I reached was somewhere between 15 and 20 mph. Isn’t this setup supposed to get more like 6 miles?


#2

edit: sorry I read that as 6 miles… yes you should see around 6 miles


#3

Not sure, I stopped every so often to check voltage


#4

whats your gearing like?


#5

It is 1:2 gear ratio, with a 70 mm wheel


#6

make sure your belts not to tight. it can cause excessive heat and wasted power.


#7

wait… hang on a minute did you say you stopped at 11.4V ??
thats above nominal… you still got plenty left in there


#8

Was it one of the rubberized running tracks or is it regular asphalt\cement? The softer surfaces of a running track would require a lot more energy to keep moving vs pavement.


#9

Hmm true, I guess I should have realized that. It was a rubber track


#10

How far can I go? I thought batteries get damaged below 11.3 or so


#11

@plongboard mystery solved!


#12

Not completely though, it was completely flat afterall


#13

You can go as low as 3.3V / Cell, so for 3S that would be 9.9V.
If you want to be concervative 3.5 / cell would be ok, again for 3S = 10.5 V.


#14

you can take them down to 9 under load. maybe 10.5 un loaded


#15

yeah what he said.


#16

Ok, that’s great to hear. I’ll test it out next time to 10.5 volts, on pavement… Thanks!


#17

Try another distance test on flat pavement. You lose an incredible amount of efficiency when the there is added rolling resistance.


#18

Yup! will do.