CKRC Lipo

[squatch71]

K, before I new what I was doing I picked up the 1500 mAh 3s lipo from CKRC. I ran it in my slash with a brushless motor...now I have charged it with a balancer every time I charged it...never charged it warm and never ran it till it died...Mamba Max esc set to 3S and soon as it cut out..I stopped running it...

now the problem. I picked up another MM from a member here and installed it in my crawler (35T)..I put the lipo (fully charged) and it ran approx 5 minuets then dumped on me, same settings and all....the time before I ran it in my slash it ran hot, but the esc never shut down and it wasn't so hot that you couldn't hold on to it....I know its a cheap battery, but how do you test it to see if it still good. The balancer still readys that all the cells are matched...I also know that my 5700kV motor was WAY to big for this little battery...but it was fun while it lasted...so is this where I learn that the 20C isn't near the snuff I need for the 5700kV in my slash...and I toasted it..that's why it won't hold a charge under load????

[Duuuuuuuude]

You f'd up by putting it in your Slash. Not enough capacity for something that heavy and fast. I tried one of my 2200mah 20c's I bought for my crawler in my Slash and it puffed it first time out.

btw: that 1500 from CKRC may not be a 1500. Mine turned out to be a 1300.

[squatch71]

I figured as much....after I got it I learned that they arn't what they say they are....


soo, its f'd....and that's ok....I just wanted another person to bounce off of...thanks

any others will be appreciated as well....

by the way...on our crawlers, the higher the burst the more wheel speed..or pop over the rocks???

[Robb]

Originally Posted by squatch71

from CKRC.

Well, there's your problem.

[Rockcrawler]

Originally Posted by Duuuuuuuude

You f'd up by putting it in your Slash. Not enough capacity for something that heavy and fast. I tried one of my 2200mah 20c's I bought for my crawler in my Slash and it puffed it first time out.

btw: that 1500 from CKRC may not be a 1500. Mine turned out to be a 1300.

X2 There is a reason that people run these 5000mah packs in there slash. Just mark it as lesson learned. :-P

You have to remember that a high C rating doesnt mean crap without a good mah rating.

[Duuuuuuuude]

Originally Posted by squatch71

by the way...on our crawlers, the higher the burst the more wheel speed..or pop over the rocks???

Kind of, yeah. Burst is the absolute highest amperage rating that its good for. Still, wheelspeed has alot to do with many other things.

Originally Posted by Robb

Well, there's your problem.

Yup. They won't be getting any more of my money, no matter how good they say thier customer service is...

[squatch71]

Originally Posted by Duuuuuuuude

Kind of, yeah. Burst is the absolute highest amperage rating that its good for. Still, wheelspeed has alot to do with many other things...

Well I know...I guess I used the wrong terminology...But I get the idea..higher the C the more punch you get...and higher the mAh as well to back up the higher C rating....

Originally Posted by Duuuuuuuude

Yup. They won't be getting any more of my money, no matter how good they say thier customer service is...

Ohh no you don't :-P:-P....I get the point, and same here....

[Duuuuuuuude]

Originally Posted by squatch71

Well I know...I guess I used the wrong terminology...But I get the idea..higher the C the more punch you get...and higher the mAh as well to back up the higher C rating....

Mmmmm, not really. A 5000mah 1c battery will put out 5 amps, same as a 1mah 5000c battery. The difference is the run times. The 5000mah running at max capacity will last longer than the 1mah at max capacity. The amp output is the same.

Here's the math. Take the mah rating, move the decimal point over three places (5000 becomes 5.000), then times that by the c rating. That will give you the available amount of amps that that battery is capable of providing.

So, our 1300mah 20c CKRC batteries are capable of safely supplying 26 amps. Not much, and that is why you killed it when you put it into your Slash.

To be safe, if you plan to use lipo to power the Slash, find out how many amps the esc will carry, then get a battery to match or exceed that number. A Sidewinder (which I have in both my crawler and Slash) is good for 75. You'd want to use a 5000mah 15c to hit the 75a mark.

[squatch71]

For my Slash....I have a Mamba Max...so to meet or exceed the 100A I need a min of 3000 at 35C, or 3300 at 30C, or 4000 at 25C.....right????


for my crawler I also have a Mamba Max..and a 35T motor, Do I still want to stay up around the 100A...or what's the lowest I would want to go and still get good performance...

thanks for the clarification....

[Duuuuuuuude]

Originally Posted by squatch71

For my Slash....I have a Mamba Max...so to meet or exceed the 100A I need a min of 3000 at 35C, or 3300 at 30C, or 4000 at 25C.....right????


for my crawler I also have a Mamba Max..and a 35T motor, Do I still want to stay up around the 100A...or what's the lowest I would want to go and still get good performance...

thanks for the clarification....

Yes for your Slash, no for your crawler. The Slash is going to pull high amps most of the time, where the crawler pulls few amps most of the time. I run the same CKRC lipo you do in my crawler with a Sidewinder and HH Cobalt Puller. Never had an issue and have more power than I know what to do with.

[squatch71]

cool, thanks for the info....

[sweli]

Originally Posted by Duuuuuuuude

Here's the math. Take the mah rating, move the decimal point over three places (5000 becomes 5.000), then times that by the c rating. That will give you the available amount of amps that that battery is capable of providing.

So if I have TWO 800mah 15C 2S LIPOs wired in parallel as a saddle pack,
would you calc the amp draw of one batter then double it?

So, 0.8 x 15 = 12 but x2 would be 24amps?

Realizing this is not ideal, but would up with some heli lipos in trade a while back and they fit well as a saddle.

thx

[indiana mudcat]

Originally Posted by sweli

So if I have TWO 800mah 15C 2S LIPOs wired in parallel as a saddle pack,
would you calc the amp draw of one batter then double it?

So, 0.8 x 15 = 12 but x2 would be 24amps?

Realizing this is not ideal, but would up with some heli lipos in trade a while back and they fit well as a saddle.

thx

it would make 1600 mah so, 1.6 x 15 = 24, and run time doubles.

[666]

I use a 50c in my Slash

[Chris_The_Battery_Man]

Originally Posted by sweli

So if I have TWO 800mah 15C 2S LIPOs wired in parallel as a saddle pack,
would you calc the amp draw of one batter then double it?

So, 0.8 x 15 = 12 but x2 would be 24amps?

Realizing this is not ideal, but would up with some heli lipos in trade a while back and they fit well as a saddle.

thx

Yes, but the C rating stays the same. Some people think when you parallel, that it doubles the C too. This is not the case.


And as far as the original question, Dude answered it right, you toasted that pack dude! Big no no. I would run a minimum of about a 3500-4000 20c pack at the very least.

[Duuuuuuuude]

Originally Posted by Chris_The_Battery_Man

And as far as the original question, Dude answered it right.

Saweeeet! What did I win?

[squatch71]

wasn't a big no no...was learning experience...you never did that?!?!? come on...



DUUUUUUUUUUDE you won our ever gratefulness of yous saying the coolest stuff.....



hows that.

[Duuuuuuuude]

Originally Posted by squatch71

wasn't a big no no...was learning experience...you never did that?!?!? come on...



DUUUUUUUUUUDE you won our ever gratefulness of yous saying the coolest stuff.....



hows that.

I was hoping for a cookie.