Which lipo to go with?
 

Hi all, I was just wondering which lipo I should I go with for my crt.5ext. It is running a MM with a mega ACn car motor (4580kv).

I have narrowed my decision down to a few. All 2s.

http://www3.towerhobbies.com/cgi-bin...?&I=LXRWF7&P=7

http://www3.towerhobbies.com/cgi-bin...?&I=LXSRT6&P=7

I wish I could fit other flightpowers, but that requires drilling new holes for battery mounting. Any others I should consider?

Thanks!:mdr:

they are basically the same exact pack except for a different brand.

do they have the same cells?

i know NOTHING about enerlend cells and all that so idk.

id go with flightpower though. this is what i have and i love it!

Why not a nue hardshell 5000 25c one?

Have a look at this:

I run the 3s2p version in my ext crt.5 and it fits great. Still allows room for the mm behind the battery too. I get great runtimes, at least 30mins, mixed bashing!

Well, I would like to stick with flightpower/trackpower because I can get them at my lhs; since I work there, I can get a discount.

I really don't like maxamps at all. I'm running a maxamps 2s 4Ah lipo now and it can barely handle 60amps.(voltage drops to 3.1v/cell)

I think I'm gonna drill some holes in the chassis to make room for some of the longer flightpowers.

Bye:mdr:

I know what you mean about the 4ah packs, they only work well in a 2p configuration, or 4s and higher setup. I have had alot of success with my 2100 cells, I ran 2 2100 3s packs in parallel in my emaxx with a 380c 7l motor. It was geared for 45 and they could delive under that load. The motor and esc got hot, but the lipos stayed just warm. I am sure the flightpower are better packs though.

I would get the trackpower pack. They aren't 20C anymore, the newer ones are the 25C cells like in the flightpower pack.
They are the same price as the flightpower pack even though you get the hard case.
You need to get the right balance harness for the trackpower though (if you already have the regular flightpower balancer). Or get the gold V-Balance.

flightpower = enerland = Polyquest = PolyRC Extreme Series = Thunderpower Extreme Series. Only difference is they're assembled by different folks. I think some other brands are also the same enerland cells but not sure. The giveaway is in the size of the cells.

It's possible some of em get the cream of the crop and others get the remainders, but fret not and choose any of the above with confidence. If you go the Maxamps route, or any other "light" pack, best of luck to you.

I'm sure they come from the same factory in S. Korea... I agree....

definetly would not suprise me.

out of those two I would pick the car pack, because of the hard case.

Would the hard case really help that much? I am looking to get 2 packs; they do not have to be the same either. Also would I see a performance difference between these?

http://www3.towerhobbies.com/cgi-bin...?&I=LXSRT6&P=7

http://www3.towerhobbies.com/cgi-bin...?&I=LXRWE2&P=7

http://www3.towerhobbies.com/cgi-bin...?&I=LXRWF7&P=7

The motor I am running says 45amps max.

Also, if I'm at the track and need to fast charge them, say at 2c(with the balancer) would it be ok? I an using the mrc 989 charger and it says 1.25c max charge rate for lipos, can that be overridden?

Thanks!:mdr:

Well guys, I hooked up my eagletree up to see just how many amps this little mega motor draws. I was surprised that it pulled 95amps max, 12amps avg, and 600watts. I think some good lipos will do this setup a favor. At 95amps, my maxamps total voltage dropped to 5.5v, thats 2.75v/cell! I'm surprised that the lipo didn't puff... I'm still undecided to which lipo to go with...

Bye:mdr:

I use a TrakPower, it hardly hangs off the chassis (pics are in my thread if you want to look) Its hard cased, so you dont need to make a whole alu mount (IMO) it doesnt hang off enough to get hit, and I can tell because I had no shrink on it for 4 or o runs, because I ran out of shrink, and out bashing, theres no scratches on it......

Hows the runtime with the trakpower?

Bye:mdr:

With my 10.5 (around 4200KV) bashing, im getting a solid 25-30 mins, I can get 50 mins if im not so aggressive with the gas, and pulling wheelie's, all of that stuff......

Ah poop, I was at my track today and found out that you can only use hard-cased lipos for racing and must have a liposack too. This means that I have only 2 options, right? Trakpower and Neu car lipo? Should I consider any other lipos? What about li-ion? I was thinking of a 2s1p a123 pack, but don't know if the voltage will be enough. I use about 120mAh a minute, so about 1000mAh for a 5min race; I think 2300mAh(a123) would cut it. Opinions/Suggestions?

Thanks!:mdr:

Do TrakPower man

There awesome!

Or cheat, and put some good cells in a hard case lol

Lot's of great cell's being deemed unusable because of the hard case rules. I wonder how long before someone releases some kind of universal or size specific aftermarket hard case?

If your track is following the new ROAR rules make sure you read this before purchasing. Also, the packs must be listed on a ROAR approved list. I dont think thi is available yet. I have to imagine that the trackpowers will be submitted and be listed.

Also pay attention to the sie limits!!

Read this for all of the info:

I'm still new to LiPos but if the 2s trackpower can rip my rustler's diff in a few wheelies with a plan MM7700kv system then i'd say thay have a LOT of power!

Dude, I hate rules! This means that the 25c trakpower lipos cannot be used because they are like 160mm long? This sucks big time! It makes me not want to race.

Bye:no:

The TrakPower lipos are not that big man

I use them in my touring car, theres the same exact size as a 6 cell nimh pack....

I called flightpower a little while ago, and they have a bunch of trakpower lipos ready to ship to ROAR for testing(a manufacture who wants ROAR to approve their product has to send them a certain number for testing). All their in-house testing passed the ROAR specifications. So, trakpowers are on their way to being ROAR approved!!!!!!!!!!!

I feel a little batter now.....

Bye:mdr:

They will be approved soon...... I see no reason why orion lipos would, and TP wont..

James is that with the stock strap or the optinal one ?. Thank's

Hey Mike, I use the stock strap and put some small al spacers under the posts. They look to be about 10mm tall, I also have a piece of velcro under the batt to keep it in place. With the spavers the top hole in the post is in jst the right place to keep it all tied down tight. The battery does get close to the spur, so I just taped a think piece of sheet steel to the pack in case it gets moved towards the spur. Very happy with these cells, I think that they are maxamp's best.

Thank's james mike said the same thing today about these cells.

acually, their not quite as tall. my trackpower fits a little looser in the battery tray than my 6 cell packs do.