lipo and 9xl
 

i have finally decided i am going to get the 9xl to run in my brushless revo to race. mainly for longer runtimes and i dont need to do 70 mph on the back straight. i found some polyquest 3s 4000mah lipo packs and am wondering what kind of runtime i should expect under normal race conditions. also, whats a good charger that i could charge and balance 6s lipo on? i was thinking the mrc rb989 superbrain.

EDIT: the packs are only rated for 64 amps max. will these be ok?

i also found some 5000mah 5s2p packs with a 60 amp continuous discharge. what kind of performance would i get from these in parallel?

Pack #1. That will work. Your runtime would probably be 15mins when racing. You could try the SB 969 for charging them since they have been upgraded, but I haven't heard anything about anyone charging Lipo with them.

Pack #2. LOTS of runtime. 10000mah should be enough to get almost an hour! Also, the batteries would not be the limit. Even one of the packs by itself would work fine.

with pack 2 squee you may get about 75-90 min or run time. with pack 1 I would guess a good 25 min of run time. Just from my exiperence.

I don,t now very much about lipo's yet. i'am thinking about a lipo setup.
but I found some scary vid's.
http://www.modelbouwbloemendaal.nl/N...p_40_76-1.html

In case you can't read that language (I can't!), here is a direct link to the video:
http://ludwigdanninger.de/Videos/Son...Explosion2.mpg

As far as the content of the video, that is definitely a possibility of happening. The chances of something as bad as that happening are very slim, though. I am sure that the person running the test set that Lipo up to a very high charge voltage, causing complete instability of the cell, which led to that explosion. But you can see that the pack let out smoke before it actually erupted. A normal person that monitors their Lipo packs during charge (and that check to make sure the correct voltage is set) should not have anything damaged because they would be able to either remove the cell from the area before an explosion, or cut the charge. Again, this is not normal for a Lipo because it was put through an extreme overcharge condition. Really the only possibility of this happening is from carelessness to check for the proper charge voltage before starting the charge.

if ur careful, and not a complete moron! then u will be fine. Just follow dierections. I remember seein thes CEMENT clydiners taht u charge teh lipos in so its safe if it explodes!! lol, talk about using scare tatics for profit!

They aren't necessarily scare tactics. If a Lipo were to combust, then the flames could ignit some other flammable material. It is all very possible, and whatever can be done in the case of a failure is good.

[QUOTE]Originally posted by MetalMan
[B]In case you can't read that language (I can't!), here is a direct link to the video:
http://ludwigdanninger.de/Videos/Son...Explosion2.mpg

I'am sorry, :o

bud your link don't work so here is the good link

http://www.helihobby.com/videos/LithiumBattery.wmv
And this one
http://www.valence.com/broadband.wmv

I really don't know much about the lipo's so that is way i put the (rong) link on the site.

still learning, lol

If you right click on the link I posted, and click Save As, then you can download the video. That video came from the website you posted.

In the last video posted, the Saphion cells are the ones that I am just starting to use in my 1/8 buggy. Obviously they are rather stable!

i think i am going with option 2. that will allow me to kick some nitro @$$. can i charge those packs hooked up in parallel? what would i set the charger at? 10 amps? and is there a charger that will do it? i know some only charge up to 7.5 amps like the astroflight if i am not mistaken.

lol, tahts gunna be crazy! NITRO!!! WATCH OUT!!! How much it costing ya?

lets put it this way, ima save at least 300 on these packs.

uhhhhh save 300 comapred to.........what? lol Did u find a REALLY GOOD DEAL???? share it with us!!!

your the reason i wont share it :L:. not to mention if you do a little research on how much a 5s2p 5000mah pack cost you can figure it out.

The Thunder Power will be able to charge up to 10amps and 10 cells in series (Lipo). Otherwise, you could charge at a slower rate (and get a less expensive charger). And yes, 2 packs can be charge in parallel. I would recommend you pick up a balancer to occasionally balance the packs to keep them as a longer lasting investment.

do you have a link to were i can find the thunder power charger?

I am pretty sure it isn't out yet.

is there a charger that can charge 5s lipo at 10 amps and preferable be able to chage nimh to?

Hi guys, I am new to the boards and I am building a bl E-MAXX. I see yall are talking about LiPo's. Has anyone looked at maxamps.com? they have up to 8000Mah 11.1 v LIPo's! sounds real good. and they fit in a E-Maxx style tray.

Yes squeeforever, The intellipeak ice charger will charge both but It only chargers 1-4 LiPo's at 1C max. for Li-Ion/Li-Po). whatever that means.

Hi MM, welcome to this forum! yeah, we know about maxamps for sure!

Nothing fancy about those 8400 packs, it are just 4P 2100's, that's why they deliver the power they can.

You can also make a 16800 mAh from it if you like

@ squee; what 5000 packs did you find? is that 5000 on 1P?

there tanic 5s2p

Squee, the Schulze chargers can do that, but I have a feeling that you don't want to dish out $250+. To be able to get the 10amp charge rate you are most likely going to have to spend $200+.

There is this charger:
http://aircraft-world.com/shopexd.asp?id=3001
Can do 5s Lipo at up to 5.7amps (120watt maximum). It can do up to 25 NiMh cells. It is pretty cheap for what it does. I realize that it still does not meet your 10amp desire, though.

using two chargers isn't that an option? to charge each pack in its own? that way you are able to balance the chargeproces as well. Pity they don't have got balancers that can communicate with eachother..

isnt there a balancer that will work with the astroflight?

Yes, using two chargers at the same time is an option. Now, why didn't I think of that? :(

The Thunder Power charger will be able to interface with the Thunder Power balancer, so the balancer can stop or change the charge if it finishes or if something goes wrong.

The Astroflight balancer may work with it, but it would make the charge take longer since the Astroflight balancer will attempt to keep the cells at 4.15v.

I thinking go extreem put two of this on your truck.

Lipo 10500mA 14.8V 4S
here you got the link it's a French site.

http://www.directmodel.fr/Produits/F.../1/SFamille/51

No not the power is the limet the money is.:L: :L: :L:

Those cells are not the thing you need.. it takes more than a 4S to run the 8 or 9XL on a savage.. and you don't want one pack hanging on one side on your savage either.

With those cells, the power IS the limit it the setup. it can max. throw out 1500 watts (if you replace the 2.5 mm2 wires) a 18 cell nimh setup can deliver about 1800 watts. you are able to get impressive runtimes with that lipo pack though.

And what if you put two of this on your savage:
LiPo "Direct Power 10500" 11,1V 10500mA 3s

I'am not saying that i want this on my truck, but i,am just curious
And found this on the internet and i wanted to share it wiht you

You can make every setup with the packs you want..

using two of them would make more sence..

6s and 10500mah....woah. strong and long.

what kind of performance would i get with the 5s2p 10,000mah and 9xl? how would it compare to my lehner xl3100 on 12 cells.

I don't now but i,think two of this, Lipo 10500mA 14.8V 4S
get the longest run time it wil be 21000mA at 14.8v
Or correct me if i'am rong you can go for 10500mA at 29.6v
depending how your wiring

true, but i am not gonna spend that much money on batteries. im talking about something at 1/3 the price. i could buy 3 set of what im getting and get more than those that your talking about. not to mention the ones im looking at are only 6 1/2" by 2 3/4" by 1 1/4". not bad for a 5s2p 5000mah pack.

I wasn,t cheking the prices
Here you got some more lipo's
5000mAh 5s2p FPEX2 Carbon
http://www.flightpower.co.uk/proddet...?prod=40525001
if you put two of de 5s2p on a 9Xl you get 61679RPM :eek:

No, you don't get 61679 rpms.. And quit staring at those RPM's mate!!!! they are useless ;)

5S means, 5 serial and 2P means 2 parralel. so 5S gives 5X3.7V=18.5 volts.. and the 2P is making the capicity twice as large. (and the discharge current will be doubles, whic is 14C with 1P the 5000mAh can do max 14C (14X5A) on 10000 mAh, it is 14X10, so 140A..

one of the best lipolies you can get is from Kokam, their 3200 can do 20C (64A discharge current) FMA has got them with a build in balancer. but what do you want with your truck, this is all getting very confusing for me mate!

Thanks for sharing that link though!!!

this cells are the bomb, when it comes to weight, capacity and discharge current!!

http://www.flightpower.co.uk/proddet...p?prod=4200016

two of those babies can power up your savage! in fact.. I am getting enthusiastic.. perhaps my maxx as well!

I'dont now all that much about lipo's yet:o

but whill this not be beter

FlightPower Evolution20 3700mAh 3s1p 11.1V. 20C constant discharge(74A) 30C Bursts(111A). Fully compatible with FlightPower Balancers. please note that this pack uses the rainbow balancing cable and so is only campatible with the 2-6s Staybalance Module. Perfect for IC conversions and high current applications. Dimensions - 22mm x 44mm x 142mm Weight - 302g

http://www.flightpower.co.uk/proddet...p?prod=4200020