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Old 11-22-2007, 08:29 PM   #16
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Originally Posted by magm20001 View Post
in terms of torque and top speed, 1.25v+ nimh will walk all over lipo's
In some cases (stock/540 brushed) that may be true, but I bet in others (mod and lower-turn BL), you'd be hard-pressed to prove that. The guys that can "feel" 12g wires will notice the difference, but I bet you could tune the combination to nearly erase any deficit.
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Old 11-22-2007, 09:40 PM   #17
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in TC most have found that BL has less power than brushed

as for lipo i run them in my offroad and they work better than c cells.
with a o7 lrp speedo.
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Old 11-22-2007, 10:34 PM   #18
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Smile LIPO VS NIMH VS NICAD

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Originally Posted by Turbo Joe View Post
In some cases (stock/540 brushed) that may be true, but I bet in others (mod and lower-turn BL), you'd be hard-pressed to prove that. The guys that can "feel" 12g wires will notice the difference, but I bet you could tune the combination to nearly erase any deficit.
LIPO VS NIMH VS NICAD USING A 540 MOTOR
GUYS IM RUNNING STOCK 540 MOTOR HERE IN PHIL AND IM STILL WONDERING ABOUT THIS NEW LIPO BATTERY TECHNOLOGY SO TO SUM IT ALL UP LIPO VS NIMH VS NICAD WHO WILL WIN???
THINKING THAT THE RULES ARE AS FOLLOWS:
ANY BATTERIES CAN BE USED
ANY ESC CAN BE USED
ONLY 540 MOTOR CAN BE USED

AS I UNDERSTAND HERE ARE THE BATTERY CHARACTERISTICS UNDER THE USE OF A 540 MABUCHI MOTOR FEEL FREE TO CORRECT AND DISAGREE WITH ME.

NICAD- HAS MORE PUNCHES UP TO THE END
NIMH- QUICK START AND SPEED ON THE FIRST FEW LAPS
LIPO- AS FOR NOW I KNOW ITS AMAZING WHEN IT COMES TO CONVENIENCE

LETS JUST SAY THAT LIPO IS A CONVENIENT WAY TO RACE HAVING TO PROVE ITS LOW MAINTENANCE FEATURES. I JUST HOPE THERE IS A STRICT R&D INVOLVE AGAINST OTHER LEADING BATTERY MANUFACTURERS THAT I CAN HOLD ON TO FOR ME TO HAVE A COMPLETE CONFIDENCE TO THIS NEW TECHNOLOGY
...
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Old 11-22-2007, 11:06 PM   #19
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With the testing i did with Lipo I noticed the peak voltage the Lipo didn't have (thats because of the charging technique used with lipo, CC CV). But at about 1min 30 secs there wasn't as much difference between them. Then in the last minute the Lipo had a clear advantage. If you look at a Lipo's discharge curve you can see how this works. I didn't need to gear up to get the most out of my Lipo. The motor will suck what it wants, theres no need to gear up.
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Old 11-22-2007, 11:45 PM   #20
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http://www.fmadirect.com/Detail.htm?...215&section=69

It's a really long battery (150+mm, don't believe the dimensions on the site). This pack will give you quite a bit more voltage than the Orion LiPo. The cells are made by Saehan Enertech, and are of very high quality. I believe Kokam consider them their biggest competitor. Unfortunately, the cells are a bit long, and there's no hard case. If you need a review, read through John Stranahan's TC5 thread. The Saehan cells are no joke when it comes to voltage, beating their cheap Chinese counterparts while still remaining safe and having very nice cycle life. You can warm the cells to around 110F before running them (during charge or after charge) to gain even a little more voltage with no adverse affects. Believe it.
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Old 11-22-2007, 11:54 PM   #21
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Originally Posted by bvoltz View Post
I think it was your pack... But one of the keys is the C rating... the higher the number the more the batteries will give up and feed the motor... The new Orion 3600 is 25C which is better then 20C and also the better the cells, the better performance you will get from the pack...

hope this helps...
BRO SO YOUR TELLING ME THAT THE HIGHER THE C RATING IS THE BETTER???

HERES THE INFOS ABOUT THE ORION BATTS HERE ITS SAY THAT OF ALL THREE LIPO BATTS OF ORION THE 3600 IS THE BES BECAUSE OF ITS "TRUE" "C VALUE" WHICH IS 25

Dimensions 3600mAh:
Length - 138mm
Width - 47mm
Height - 23.5mm (22mm height between bumps)
Weight - 220g (7.7 oz.)
True 25C
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had lipo less power than NI-MH?-orion-3600.jpg  
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Old 11-23-2007, 12:34 AM   #22
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I think nimh has more initial punch when running stock. but for mod lipo are the thing to go. charge it a week before the race, and the power is still the same.

Even different brands of lipo produce different punch and power.
I had 2 types of lipo, one is orion 4800mah and another one from top 4700mah. the orions had more punch and power specially when racing stock. very very slight difference.
And regarding balancing, the orions were .01v out balance while the other one was .04v out balance after 15 cycles.
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Old 11-23-2007, 01:18 PM   #23
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Default Lipo size

If I switch to Lipo for the 1/12 scale what is a good size to throw in to start ? I would probably only get like 2 packs and that is that one main and one back up pack. I might have to get a few and test the difference
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Old 11-23-2007, 06:21 PM   #24
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have lipo less power than NI-MH?

The right answer is yes...and no.

If you pick up a 4200mah NiMh pack and a 3200mah Lipo pack and if you connect them to a discharger at low rate you will read that from the 4200mah you will take out of it around 4200mah. In the some way from the 3200mah you will get out around 3200mah.

This means that if plug to each pack a light bulb of the same power the one connected to the 4200 pack will be lit longer that the one connected to the 3200 pack.

But if you put each pack in a car with a 3,5T or 4,5T or 7700 or 6900 Brushless motor with the correct ratio you will drive as long with the 3200mah as with the 4200mah and problably you will find more power with the 3200 lipo. (I can tell you this by experience at the track)

That happens because lipo cells are much more eficient then NiMh cells, just that. (you notice that lipo do not get so warm as NiMh)

The difference between packs will be more noticeble the hotter your motor is.
In this same logic if you are driving 27T brushed or 13,5T brushless (low discharge rate motors) you will notice that you have more power with the 4200NiMh and problably drive longer.

Rick H. (from peak racing) explained this allready in a post I do not remember where.

Last edited by PDM; 11-23-2007 at 07:01 PM. Reason: change a word
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Old 11-23-2007, 06:56 PM   #25
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thanks for many reply.

korea(where i live) weather is winter now.

the recent temperature is about -1C ~ 15C.

as i know, li-po is very sensitive for the temperature..(When charging, running)

especially in cold weather, li-po do not show good performance.

so i quess this bad performance cause from cold weather.
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Old 11-23-2007, 07:06 PM   #26
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Quote:
Originally Posted by PDM View Post
have lipo less power than NI-MH?

The right answer is yes...and no.

If you pick up a 4200mah NiMh pack and a 3200mah Lipo pack and if you connect them to a discharger at low rate you will read that from the 4200mah you will take out of it around 4200mah. In the some way from the 3200mah you will get out around 3200mah.
Thats not exactly true, good Nimh batteries have an efficiency of about 78% to 80% (the average Nimh battery is around 70% efficient). Where lipos have an efficiency of 98%. With a 4200 Nimh battery you would take out around 3360mah if your charger gave to accurate readings. And with a 3200 Lipo you would take out 3136mah.

Woops, I can see you said that later on. Oh well theres the numbers.
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Old 11-23-2007, 08:17 PM   #27
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Originally Posted by Swift and Sleek View Post
BRO SO YOUR TELLING ME THAT THE HIGHER THE C RATING IS THE BETTER???

HERES THE INFOS ABOUT THE ORION BATTS HERE ITS SAY THAT OF ALL THREE LIPO BATTS OF ORION THE 3600 IS THE BES BECAUSE OF ITS "TRUE" "C VALUE" WHICH IS 25

Dimensions 3600mAh:
Length - 138mm
Width - 47mm
Height - 23.5mm (22mm height between bumps)
Weight - 220g (7.7 oz.)
True 25C
Yes, that is one piece of it. Sure all the new packs created could have the newer cells in them which could be 25C. But people could have inventory of of the older cells that are 20C.....
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Old 11-23-2007, 10:39 PM   #28
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Originally Posted by bvoltz View Post
Yes, that is one piece of it. Sure all the new packs created could have the newer cells in them which could be 25C. But people could have inventory of of the older cells that are 20C.....
That is scary it means that some batts has 25c labelled on its features but really its not 25c and only 20c? How can we determine that though?
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Old 11-23-2007, 10:42 PM   #29
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Originally Posted by Swift and Sleek View Post
That is scary it means that some batts has 25c labelled on its features but really its not 25c and only 20c? How can we determine that though?
From Orion, I really do not think that they would mis lable them. It is a simple question of is the pack newer or not...
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Old 11-23-2007, 11:10 PM   #30
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Originally Posted by bvoltz View Post
From Orion, I really do not think that they would mis lable them. It is a simple question of is the pack newer or not...
TNX FOR THE REPLIES
ANY DETERMINING FACTOR ON HOW TO SEE IF IT IS NEW OR OLD?
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