mAh Per Mile – Part 1 – Formulating the formula

By Tony Phalen on Jun 09, 2017

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There’s one question we hear a lot – how far will your rig go on one battery? To find the answer, we’ve created a little formula; “mAh Per Mile.”

In Part-1 of this series, we break down the ‘how far will it go’ question and fill you in on how we plan to find out using this formula.

mAh Per Mile started as a controlled test to see how long a stock Axial SCX10 II RTR (using the included 35T brushed motor) can travel based on the mAh of a battery pack. This data can then be adjusted based on the mAh of a larger pack.


mAh Per Mile - Duratrax Onyx Batteries Used

WHAT DID WE START WITH

The initial test started off with two different battery packs – a 2S and 3S LiPo. Because we were only looking for base numbers, we chose mini packs so we wouldn’t be walking around for hours.

Both LiPos were charged at the recommended amperage for safety.
Duratrax Onyx 7.2V 2000mAh LiPo Battery
Duratrax Onyx 11.1V 1300mAh LiPo Battery


RESULTS

Using a stopwatch, we timed each battery, running the SCX10 II at full speed on a flat surface until the LiPo cutoff in the ESC stopped the forward motion. This gave us a set of minimum runtime figures with which to start. Here’s what we found:

• The Duratrax Onyx 7.2V 2000mAh LiPo Battery produced a runtime of about 58 minutes at a speed of 4mph.
• The Duratrax Onyx 11.1V 1300mAh LiPo Battery produced a runtime of about 36 minutes at speed of 6mph.

We should note that batteries can differ from manufacturer to manufacturer, so your times may not match up to ours.

mAh Per Mile - Recorded Times

So now that we know the minimum runtime on a flat surface, the next step is to get the truck out on an actual trail and see how all this data stacks up.

Stay tuned for Part-2 of mAh Per Mile!


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