kuzo

iTrader: (11)

Ok this is probably a stupid thought...I have 2 of these coming for now. I've read that they are 30% lighter than GP3700s and technically if I put two one their sides the total width will be close to the width of a side by side NiMH pack just being taller. So if wires in parallel, they would produce 9600 mA which for bashing purposes, would be incredibly nice. I'm running a short geared ss5800 in a T4 so heat shouldn't be significant.

What runtime could I expect with this unless I'm risking any serious damage to my equipment?

WorldCup2004

With 2 packs about 35 to 40 minutes

GordonFreeman

iTrader: (2)

I get 32 minutes in racing conditions with my 6600 mAh pack in a B4 with a 5.5 Brushless. It just makes weight.

WheelNut

iTrader: (5)

Not sure if any of you guys were aware of these packs that are only $40 more than the Orion packs, wont terribly unbalance your car, and be the only pack you need for a days racing (with mabye a bit of charging between rounds). Plus they are the same size as the Orion packs.

http://www.maxamps.com/index.html?la...d=38743.584028

I'm going to order one in the next week or two, I've heard good things from the few people who I've seen online with them.

hobbipro

iTrader: (23)

Kuzo, I just use the included wire adapter, but then cut the tamiya plug off and solder on a deans. The adapter has orion plugs on the other end, that can be removed and soldered directly on your ESC.

xrayaustin

iTrader: (12)

i was at my local track the other day and a guy was running 6200's but the battery pack cought on fire! Has anyone else had or heard of this problem.

or8ital

iTrader: (38)

Its one of the downsides of Lipo. They are more fragile then other batteries. Do a search on here and you will find plenty of stories about it.

WheelNut

iTrader: (5)

Li-po's are more fragile than a Ni-xx battery pack, but if properly taken care of they will not give you any trouble. There are 3 ways to wreck a li-po (the fellow at your track obviously did one of them!) 1. Over discharging, once the battery starts to fade you must immediately take the car off the track, do not continue discharging it. 2. Over charging. 3. Shorted cells, obviously this will ruin any battery, although a Li-po battery can react more violently to this than a Ni-xx battery would. Blowing up li-po's that are properly cared for is very rare, as is blowing up a properly cared for Ni-xx battery.

Darkseid

iTrader: (9)

I see a lot of the people here are using these with brushless systems. What I want to know is whether there is any special care you need to take when using these with the standard speed control/brushed motor setup.

I plan to use this in my 1/10 sedan with my Futaba MC800C ver.2 speed control and 19turn motor.

Anything special I need to do with the electronics. Or is it pretty much charge(properly ), plug, and play.

WorldCup2004

Thats why Team Orion works with Kokam they are safe Lipo not like others....

linger

iTrader: (1)

Interestingly enough, I had the opportunity to chat with a Kokam engineer at a trade show who actually designed the RC cells. In the case of overloading the cell (like shorting it out, overcharging etc) the cell is designed to expand. Once the cell expands, it creates internal open circuits, which stops the battery from discharging. Kokam did some extreme testing on the cells, from overcharging, to over temp and even driving a nail through the cell with no incidents of explosion or fire. Good stuff.

Spillertwo

Hello everybody,

I just bought three of the platinum lipo batteries and have been doing some testing to test them in comparaison to my normal batteries.

Here is what I know so far:

I charged them at 4.8A and discharged them at 9.6A until they reached 6 volt.
I charged a normal GP3700 pack at 5A and discharged it at 10A until it reached 5.4 volt.

For the Lipo:
+ charging it until it reaches 8.39 volt took 49 minutes
+ then the charger starts dropping the charge current to keep them at
a constant voltage. When you leave it charging like that, total charge
time is 1u47min until full charge is reached
+ at the moment of full charge it is charged with 4.845 Mah and has reached
a peak temperature of 28° celsius.
+ then I discharged them and they delivered: average voltage of 7.28V
and a discharged capacity of 4.921 Mah
+ peak temp after discharge is 32°celsius

Comparaison to GP3700:
+ the GP cell takes 47 minutes to charge
+ discharging them gets them up to 62° celsius
+ discharge gives you an average voltage of 7.1 volt and 3.180Mah

So my conclusion thus far is:
+ the Lipo's don't reach the same temperature as the normal cells and
therefore should keep their capacity and power much longer
+ the Lipo's offer an extra runtime of about 55% compared to GP3700

The only thing that puzzled me was that the charger gave an internal resistance of 41 for the Lipo's and only 32 for the GP3700. I would have expected the internal resistance to be lower of the Lipo's.

I am now testing if it is true that you can charge them days ahead of the race and still get the same power. I have charged my packs completely and will leave them alone for four days. Then I am going to discharge them to see if I still get the same capacity and voltage as before.

So far so good, track testing will be done on tuesday and I am wondering how they will perform.

Greetz,
Spiller

WorldCup2004

Very interesting, have you tried them in your car, more power ?

daniz24

I think with 10A discharge and the result are avg 7.1 volt and 3180 mAh it must be pretty old pack.

Darkseid

iTrader: (9)

I keep seeing people discussing discharging the cells. I thought there was no need to discharge them.