Some 8th scale vehicles have less efficient drivetrains and/or are heavier than others. Low C packs will give less performance on those, and will also be more subject to heating up and puffing, particularly if you like to run to LVC cutoff. I've used 20c packs on my 1/8 as well as the current set of 60-70c packs that I run (all 4s), and never had an issue, though performance and punch is much better with the higher c packs. I doubt you'd see much of any difference from 40c to 65c though, which is probably why they use that number. The other thing you can sometimes run into with low C packs is drawing so much that you dip voltage to below what the BEC likes, causing glitches or slower servo operation under high motor amp load. I've only seen that on 2s though. You won't damage anything though, except perhaps if you continually bounce around the glitch/brownout area.

Go to the Tekin website and go to the service section and it should have all the things that you have to do and forms that need to be filled out. You might have to get an RMA from them.

ok thanks mate

Have a hpi vorza. What setup should I go for should I just put the 2250 in it as it just had a 2200 torx come out of it. Just want it to be insanely quick

Someone on traxxas forums was in that exact situation running 5000 25C traxxas lipo and fried RX8. Tekin told him basically he void warranty by running it with 5000mah 25C and refused it as warranty repair due to used battery. I am not sure how or why it can damage it physically . Maybe it has something to do that MM has top current 120A and tekin 210A.

But if low C can damage ESC they should not just recommend 40C, they should insist on it and mention it in manual. Maybe some one from tekin can explain, so can I use my 5000 25C battery wit RX8 gen2 safely? And is it really about 40C at least no matter what capacity or is it about that total Amps, so 30C 7600mah = 230Amps is OK.

best man to ask about this is randy

In our experience the C ratings for batteries have no standard. Many 20C or 30C batteries are actually closer to 15C performance. We have seen many 20C or 30C batteries puff in use. We have also seen good 30C batteries run fairly well in moderate setups. We suggest 40C or higher to keep people from being unhappy over things we have little control over and avoid damage to the controller.

It is C rating times capacity for total current. So a larger capacity battery with a lower C rating in theory can perform like a smaller battery with larger capacity... in theory if C ratings were legit from all manufacturers.

Poor batteries are very hard on electronics and absolutely cause failures. The voltage can bounce up and down dramatically and stress the power caps and other components. You can clearly see the difference between a good battery and a poor battery in our data logs if you look at the voltage drop under load. If it looks like the rocky mountains it is a poor battery.

Oh yeah! Good call on the data log for voltage drop, forgot that one was there.

I logged 2 runs on the same day back to back with similar temps and my gforce 70c 6000mah batteries dropped to 6.7v under full throttle one minute into a full pack and my 65c 5300mah gens ace only drop to 7.07v 1 minute in. Gforce = junk and tekin helped me figure that out. Thanks

Very good to know. I've been noticing differences in power with my Orion and SMC packs. The SMC's seem to have more punch early on, but lose it quicker. The Orion's tend to be more consistant. Curious how they will look on the data log.

Yup!

If you see a lot of "bounce" on the Voltage line this can indicate "soft" packs. Good to see it being used.

Guys when I ran my RX8 Gen2/pro4 4600kv it did fine when you go forward but if you were to reverse it lagged a lot. I had to hold the reverse button for like 5 seconds for it to even back up. The brake works good but no reverse?

Reverse takes a few seconds of not touching the trigger to engage. That's normal.

It is a delayed reverse.

Randy, post a data logging video on TEKIN channel on youtube
It will open people's eyes!

Can u post link not seeing it