Oct
Here’s a set of tests conducted on a new Roller, a Dingo and a Guppy.
The presented method relies on measuring and subtracting the voltage drop component that corresponds to the internal resistance of the battery from the total measured drop. The voltage drop on the battery “outside” the mod is practically the same as its contribution when it’s placed “inside” the mod, since the current is almost the same in both cases (the resistance of the mod is very small compared to the resistance of the load).
Note that the method presented here can be used to calculate the voltage drop on any mod with only basic equipment requirements.
The units tested are not hand-picked: The results of the Dingo are slightly above production average, the results of the Roller are slightly below production average, while the results of the Guppy are spot-on and are much more consistent on a production level due to its small number of parts.
-Roller-
Tested in the following modes using AW IMR 18500/18350 batteries:
- 18500 with stock spring @ 1.0 Ohm Load
- 18500 springless @ 1.0 Ohm Load
- 18500 “Bugged” @ 1.0 Ohm Load
- 18350 @ 1.0 Ohm Load
Results:
- 18500 with stock spring @ 1.0 Ohm Load: 0.16 V drop.
- 18500 springless @ 1.0 Ohm Load: 0.11 V drop.
- 18350 @ 1.0 Ohm Load: 0.06 V drop.
Voltage drop of the Bug @ approx. 4 A load: 0.09 V.
-Dingo-
Tested in 18350 mode with stock spring, using an AW IMR 18350 battery:
Result @ 1.0 Ohm Load: 0.04 V drop.
-Guppy-
Tested using an AW IMR 16340 battery:
Results:
- @ 1.1 Ohm Load: 0.02 V drop.
- @ 1.9 Ohm Load: 0.01 V drop.
Hi
I’m not quiet sure I understood that right.
Is the voltage drop lower on the 18350? The lower the mAh & AMPs the less drop? Or have I misunderstood this?
18350 @ 1.0 Ohm Load: 0.06 V drop…. the lowest drop from all batteries or not?
Feedback please.
Thanks.
MOE
Hey Moe,
No, this is a measurement of voltage drop on that specific device, after subtracting voltage drop on the battery. If you watch the video carefully, you will see that voltage drop on the batteries is measured separately. You can find more details here – http://demo.afternet.gr/atmizoo-old/blog/voltage-drop/?lang=en
When the telescopic tube is unscrewed, voltage drop on the mod is expected to rise slightly, depending on the condition of the threads.
Results will vary when looking at different devices — for example, this particular Roller performs below average when the telescopic tube is extended. Rollers and all telescopic devices are in general less consistent. Their performance is highly dependent on the condition of the threads, which tend to oxidise and gather dirt.
Devices with less threads will always perform much more consistently. In this context, consistency means that if you take 10 used Rollers and measure them, the results will have a much higher variance compared to 10 used Labs or Guppies.
Other than that, the battery should be selected according to the resistance you are using. Check out this post for details – http://demo.afternet.gr/atmizoo-old/blog/notes-sub-ohming/?lang=en
Voltage drop on the internal battery resistance is always much higher than voltage drop on a good mod and will increase as the battery gets stressed. There is not much point in splitting hairs with mod voltage drop when the voltage drop of a high quality battery is so many times higher. Mod voltage drop should only be used as a rough indication of its condition: voltage drop on the mod increases = maintenance time.