Can we get some feedback on the Nano Tech Lipos Please

[Jahay]

Thank you for uploading your pics.

From looking at your pics, the soldering work looks much better, cleaner than the hyperion lipos! You would actually be able to inspect for damage...

[brian015]

Originally Posted by pinkpanda3310

I've read a number of people talk about the highest amp spikes being missed. I would have thought of all the people here with loggers someone would have logged one of those spikes by chance. Yet I rarely hear of anyone getting over 200a. I think that is because the batteries have there limits and the loggers are reading the spikes. If I were to draw 300a or 400a spikes wouldn't that drop the voltage excessively and be noticable on the logger?

I hear what you're saying.

The reason I suggest that the highest spikes are not being recorded is because I see minimal difference in the highest currents logged in my 30c 3600mah 10s vs. 40c 5000mah tests (92-99Amps - And part of that difference could be explained by slightly different gearing). Anyway, looking at the logger would indicated similar performance between the two sets of packs.

But, in fact, what I observed is that the 40c packs had much more punch when driving - clearly noticable differences in acceleration. The truck was easy to control under hard acceleration on the 30c packs - whereas with the 40c packs it had significantly more power (and therefore somewhat harder to control). This difference did not register in the logger, however. It simply may not have the sensitivity to detect very short, high spikes.

Those are my observations, anyway.

[Nard Cox]

Turnigy 4S :

[reno911]

Wait till you see the Blue Lipo, the leads weren't properly wet before heating to the board. Allowing the wires to fray and peal away from the joint on impacts. I hope the 5000mah that has been doing so well with me has better connections. Though the 5000mah has a front center exit and those setups usually have more wire inside the case, so less tug and pull compared to a side exit.

[pinkpanda3310]

Originally Posted by brian015

I hear what you're saying.

The reason I suggest that the highest spikes are not being recorded is because I see minimal difference in the highest currents logged in my 30c 3600mah 10s vs. 40c 5000mah tests (92-99Amps - And part of that difference could be explained by slightly different gearing). Anyway, looking at the logger would indicated similar performance between the two sets of packs.

But, in fact, what I observed is that the 40c packs had much more punch when driving - clearly noticable differences in acceleration. The truck was easy to control under hard acceleration on the 30c packs - whereas with the 40c packs it had significantly more power (and therefore somewhat harder to control). This difference did not register in the logger, however. It simply may not have the sensitivity to detect very short, high spikes.

Those are my observations, anyway.

I don't doubt your obs at all. In fact they re-instate higher c ratings perform better. If your gearing were to remain the same for both setups it might look like this...
Battery(s) 1 = 10s 3600mah 30c
30c*3.6ah=108amps (continuous)
37v (10s) *108amps=3996w max continuous
Your setup as indicated- 37v * 92amps=3404w peak

Battery(s) 2 = 10s 5000mah 40c
40c*5ah=200amps max continuous
37v*200amps=7400w max continuous
Your setup- 37v*99amps=3663w peak

259w is a bit of difference but I'm sure the 40c battery holds it's voltage better when under load so the difference in real life will be greater and therefore a noticable difference when driving. Even larger than that difference is the capabilities of the different batteries. The logger doesn't show that much difference because the system is not drawing any more than it needs. At those amp rates the solder joints are less of a problem.

As for the spikes, I am still not convinced a system will shoot off enormous 'invisible' spikes that the logger can't detect (given perfect timing for the sample). The spark when the batteries are plugged in would be a good spike and fast too. I reckon I'll even test that theory, my logger will start recording when a set amp# has been exceeded. But when the system is in action all lines are full of electicity and produce resistance. I don't fully understand voltage ripple but it seems more plausable than huge amp spikes.