This is a little scary...

[BrianG]

Originally Posted by whitrzac

...the batt was hot enough to melt snow....

So, 32.1*F?

[whitrzac]

Originally Posted by BrianG

So, 32.1*F?

*failed at thinking of a smart___ comment*


It was 90*f+ after 1-2min...

[rawfuls]

You know, I was thinking of this exact thing yesterday...

I was wondering what they do with all the packs don't somehow don't manage to even pass their quality control.

I guess now they're gonna sell em.

how the hell did you jump your car with 4s 5ks?

[bdebde]

Originally Posted by rawfuls

You know, I was thinking of this exact thing yesterday while shoveling some dirt my dad..

I was wondering what they do with all the packs don't somehow don't manage to even pass their quality control.

I guess now they're gonna sell em.

how the hell did you jump your car with 4s 5ks?

Shoveling dirt for your dad, with your dad or on your dad?

[rawfuls]

Originally Posted by bdebde

Shoveling dirt for your dad, with your dad or on your dad?

All of the above?

[simplechamp]

Originally Posted by brushlessboy16

At least they are honest about what they are selling instead of trying to put some rediculous rating on them and up the price..

I applaud them for just telling the truth.

I can agree with that for the "B-grade" rating, but look at the C-rating. They say they are for low discharge testing, and then rate the pack at 40C? Doesn't make any sense to me. IMO low discharge is 5-10C (and even that, if truly a constant current draw, can be tough on packs)

[whitrzac]

Originally Posted by rawfuls

You know, I was thinking of this exact thing yesterday...

I was wondering what they do with all the packs don't somehow don't manage to even pass their quality control.

I guess now they're gonna sell em.

how the hell did you jump your car with 4s 5ks?

you strip the wires and hook the jumper cables up...

1-2 min later you turn the key...

rocket science....

[rawfuls]

Originally Posted by whitrzac

you strip the wires and hook the jumper cables up...

1-2 min later you turn the key...

rocket science....

Oh... I knew that, duh...

[nativepaul]

I think you guys are looking at low discharge the wrong way round, I believe low discharge in this instance refers to low voltage not low ampage ("C" rate)
say you've set up a new car and want to know if its going to make the 20minute race time why risk running your expensive race pack right down to the LVC and reducing its lifespan if you can get a dirt cheap pack to test it out and adjust your gearing if necessary before doing 20 mins for real. The same applies to planes even more so, as when flying certain maneuvers if you where to hit LVC it would mean a certain crash most people time their flights so they never hit LVC, but how do you find out what that time is? you turn the LVC off or set it to 1 cell less than you have so it wont kick in then fly agressively till you hear a reduction in RPM or performance and land ASAP then set the timer a couple of minutes short of what you just ran and set the LVC back up, now when you fly you know you will never hit LVC but you have just overdischarged a pack, do you want that pack to be your favorite thunderpower pack or a turnegy pack that has higher than normal self-dishcarge and takes forever to balance but was dirt cheap?

Originally Posted by whitrzac

you strip the wires and hook the jumper cables up...
1-2 min later you turn the key...:

I'm not surprised your battery got hot doing it like that, I am surprised you didn't puff it though, you were lucky not to overdischarge it. I have jumped a neighbor's car with a turnigy 30C 4s 5Ah pack but I had him get in and try to crank it, then applied the bullets to his battery lugs and presto it turned and fired straight away, total connection time less than 3 seconds and no chance of overdischarge. The 8guage wires got warm so I suspect it was pulling 3-400A but as anyone thats ever shorted a LiPo can tell you, LiPos are very good at high current short duration bursts, its heat build up that kills them.

[simplechamp]

Here's a short video from HK showing how they sort the "B" grade cells from the rest. Wish they would say what kind of tolerances they allow e.g. what is the max internal resistance an "A" cell can have.