lehner 2250 13turn - Page 5 - RC-Monster Forums

Serum · 04.28.2006, 10:15 AM

for speedrecords, you need lipo's, for bashing, you want NIMH.

Sylvester · 04.28.2006, 10:19 AM

Same thing as serum said, and ebay ib4200's... well, i wouldnt trust, you can try www.boomboombatteries.com , i got my packs from there, SxS, they are a great price! And theyre awesome, my truck screams!

extremexmods · 12:56 PM

Can I use the "bash pack" (4200 mah, stick pack, $35.00 each, or would side by side packs be better? How many volts do these packs really produce under load? Would it be safe to use 36 of these cells (6 6 cell packs) on the BK 36150 with the 2250 13 turn, or is that risking electronic death? How does charging at different amps settings affect the batteries? How good are the integy 4200 mah packs, and the 4200 mah packs from other manufacturers?

extremexmods · 04.29.2006, 03:53 AM

Is there any response from anyone please?

Serum · 04.29.2006, 04:05 AM

What brand are those 35 dollar 4200mAh packs? depending on HOW stickpacks are build, they can be soldered end to end or connected with a shitty little piece of thin metal (those are a big nono) what i like about side by side packs is that you can take out a cell that goes bad. with soldered inline packs, this is hard to do. There are tubes available though, that you can use to put in cells and they will connect thru some sort of zilver paste. seems to work like a charm too.

Integy usually uses IB or GP cells. they are okay.

I bought some GP3300's that produce 1.213V@20A load, that are good numbers.

If you take 100A out of those little buggers, it's voltage will most likely drop till 1V or lower. Rule of thumb is that a good cell can deliver app. 100W

36 cells on that setup is not asking for trouble electronicall wise. It more is a problem to keep the driveline in tact.

about the quality of the cells;

under 100-150A load, nothing seems to beat the GP3300, with those kinds of setups, you won't notice a .01V difference per cell. Again, you really don't want a 70 mph truck to jump with.. And if you do.. PLEASE make a movie, i wouldn't mis it for anything in the world!

For bashing i would take 26 cells.

there is a difference in need for speed for speedruns and bashing.

Tom F · 04.29.2006, 04:46 PM

It's easy to build the packs, it's cheaper, and you can build them in whatever funny shapes you want :)

Serum - where did you get those cells?!

If you're running huge currents then i would imagine you want some big LiPo or LiMn cells. Apogee are selling 3S packs 3800mah 20C packs - thats 76Amps.

If you ran 4 of those, you'd have nearly 3.5Kw of power to play with...

I was speaking to the guy and he said the average loaded voltage is 3.8 and they have a lower internal resistance so run cooler and the voltage doesn't drop as much under load...perhps you should think about using those?

Sounds like a great project - good luck.

Serum · 04.29.2006, 05:31 PM

I got them in Germany, so it's fair cheap for you to get them to the UK.. no customs or so..

extremexmods · 04:26 AM

Quote:

Originally Posted by Serum

What brand are those 35 dollar 4200mAh packs?.

They are these packs.
http://www.boomboombatteries.com/pro...x?ProductID=58

Tom,
I have realized I have no way to afford lithium and strengthen the truck to handle this type of power. I think strengthening is more important.

Here is a good review. The whole site is awesome, a real basher's dream, but a racer's dream also.

http://www.beatyourtruck.com/prodreview-IB3800.html

Also, is $6.99 a good price for unmatched Gold Peak 4300 loose cells, or are the $35.00 4200 mah stick packs the better deal? How important are an extra 100 mah, are they really worth the extra cost?

Serum · 04.30.2006, 04:16 AM

I don't know if Alex soldered them end to end or they are spotwelded.

Only Alex can tell.

But lipo isn't able to put out more power than normal cells, it is more power per lb, so the trucks drivetrain actually is better of with lipo.

You don't need a big ass set up like that to have fun though! i read stories about a XL3100 on 12 cells going 50 mph.. (it depends a lot on the quality of the cells) i am going to make a maxx with 6S lipo and a small motor, such as a basic XL, feigao S or lehner 1930.. make it light, and easy on the drivetrain, because of it being light. ( i am going to use a low kv motor though)

extremexmods · 04.30.2006, 04:28 AM

Is it possible to dissassemble stick packs?

Serum · 04.30.2006, 04:31 AM

If they are spot welded using a thin metal sheet, then yes.

If they are soldered there is no need to dissemble them right? (it hard, but doable though)

04.30.2006, 05:33 AM

Im sure alex can make ib4200 in side by side formation, just pop him a email.

Sylvester · 04.30.2006, 12:07 PM

I got my ib 4200s from alex in 8 cells side by side config.

Tom F · 04.30.2006, 12:51 PM

Quote:

Originally Posted by extremexmods

They are these packs.
http://www.boomboombatteries.com/pro...x?ProductID=58

Tom,
I have realized I have no way to afford lithium and strengthen the truck to handle this type of power. I think strengthening is more important.

Here is a good review. The whole site is awesome, a real basher's dream, but a racer's dream also.

http://www.beatyourtruck.com/prodreview-IB3800.html

Also, is $6.99 a good price for unmatched Gold Peak 4300 loose cells, or are the $35.00 4200 mah stick packs the better deal? How important are an extra 100 mah, are they really worth the extra cost?

I've heard nothing but good things on the BBB packs - so i bought some last night.

Will give some feedback when they come/i've built them :)

I'm of the opinion that you dont need such a monstrous set up to have fun as the others said - if things are breaking cos it has an obscene ammount of power and a lot of weight - then it will suck.

Pick something like a Plettenberg Bigmaxximum or Lehner 1930, and run on like 18 cells.

Cheaper, less powerful (but still 1800W is a huge ammount of power) and you can get away with using cheaper cells cos of the reduced current draw (and that = less weight, less wear, more acceleration and more runtime)

Lots of cells and huge motors are fine in a 5th scale thing like an FG or something, but to be honest i think you'd have more than enough power with a cheaper set up - and a lot more fun.

extremexmods · 06:56 PM

Are Gold Peak cells better than Intellect Batteries cells?. The Gold Peak cells seem to have a higher price pe mah rating compared to Intellect Batteries? I also think the drivetrain is fine.

Here is promods thread about his truck.
http://monster.traxxas.com/showthread.php?t=231706
Look at his drivetrain setup, mine will be made much stronger than that. I think a good setup will be using a 2250 13 turn on 36 cells with full CVD's, alluminum diff cases, and robinson racing diff gears if the stock one strip out. I do not abuse the trock and drive it very nicely on pavement only at high speeds, and I never allow myself or anyone to jump my emaxx at any speed or height.