Run time is dramatically lowering...
 

Hey guys,

I'll start by saying that I am running the battery through a traxxas slash 4x4. Track driving and pretty hard bashing on the golf course in my backyard. So, to be fair, my no means am Ibeing nice to the car :P

I have just recently bought a Dynamite 2s 7.4v 4200 mah 25c battery. Just to test out the brand and see how it performs compared to others. Ihave run many 2 and 3 cell venom brand batteries through the car with much better luck. Just curious what your thoughts were on maybe how Icould point the finger at the problem here, if anything else other than particular brand.

Ihave had the battery for around two months now. When the battery was close to brand new, it was lasting close to 35 minutes per run. The run time alone has been steadily lowering since, as of today, the run time of the battery was just over 15 minutes.

I guess my question is, what reasons can Iattribute to the drastic drop in run time of this particular battery. Like Isaid, I have had no similar affects running venom batteries through the exact same 'bashing'.

The only thing Ican personally say to perhbaps attribute to it, is the the weather here in Texas has changed quite a bit in the last two months and it is now entering summer going into higher heat and humidity. Can this alone be responsible for that large of a drop in run time?

RE: Run time is dramatically lowering...
 

Hi, welcome to RCU.

I don't think the heat is the cause. Reduced capacity is an indicator of a damaged battery , I would bet that the dynamites are some of the bottom of the barrel for lipo packs. This is the second report I've heard of dynamites not holding up very well.

A sure way would be to test one against a new pack , but then the cause would still have to be determined.

RE: Run time is dramatically lowering...
 

You probably allowed the voltage to drop too low, thus damaging the battery.

RE: Run time is dramatically lowering...
 

I kinda ruled out your routine since the other brand batteries are holding up ok for you , right?

RE: Run time is dramatically lowering...
 

Yes guver, the venom batteries are holding up just fine comparatively. The only difference being that the venom batteries are 20c and this dynamite is 25c but that should be irrelevant towards this I would assume.

The Velinion speed control i am running on the car has a low voltage detection setting that I run every time of course. With that said, i guess the question is...what are the chances that the particular detection can fail and/or react too late?

As there are a couple different kinds of low voltage protection, what would you perceive to be the safest one?  And would you advise me to perhaps use a different kind that what I am already using?

RE: Run time is dramatically lowering...
 

I suppose any of them are fine, but it is a mistake to rely on a lvc or lvd to tell when to stop running. I liked the one that monitored individual cells and reduced throttle thru the esc when any one cell dropped below a certain point. They should be used as a fail-safe if one happens to lose track of time or forget to charge battery, ect.