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Old 06-20-2008, 02:02 PM   #76
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Originally Posted by Fred_B View Post
On the chemistry side I would tend to agree but the two cells will have totally different internal resistance. I would assume that IR is pretty important along with how efficient the cell is at accepting charge.

I have well over 200 cycles on my Orion pack without issue so it's not killing my cells. Your results may vary.
I suppose we'll just have to disagree. I just can't bring myself to take the experience of people that have owned a handful of LiPos compared to someone that does it all day for a living. If that style of testing is good enough for a company that's about to buy more batteries in a single purchase than all the combined batteries ever sold in R/C, it's good enough for me. :-)
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Old 06-20-2008, 02:47 PM   #77
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it's either not clear or it's hard to comprehend the point you're trying to make when you bring it up like it's some new idea or something.
Because what PFM are saying is that you should not balance charge because it will not prevent an unblanced state at full discharge.

There are only two states where unbalanced pack will cause damage, over charge and over discharge. Balance charging protects against overcharging, not allowing you lipo's to 0% prevents over discharge.

Matched cells do neither.
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Old 06-20-2008, 03:46 PM   #78
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I own both and I am happy with both kind... I think as long as you take good care of your batteries and over do things there is nothing wrong with any of them.

each of them has advantages and disadvantages, but I see no reason to hate one and like the other.

I thing this is like the "Shaft vs Belt" argument.
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Old 06-21-2008, 01:09 AM   #79
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Here's what I've learned over the years of using lipos.

Yes, charging at 1C is the accepted norm and is the SAFEST way of charging lipos.

Yes, you do need to balance, but occasionally (every 4th or 5th cycle) if you charge at 1C to get the best out of the packs.

Yes, you should only get quality packs. There may be some cheap lipos that are good but this is very hit and miss.

NO you don't need to get 'matched cells'. you can if you want but it's not necessary. the chemistry is pretty good as is.

NO you don't NEED to get a balance charger but I do like them because of what they can do. I've been using an astro blinky balancer for years and each cell has always been at 4.200V (measured with a multimeter every time I balanced) and the packs I have still run circles around fresh NiMH packs. One of them even passed it's second anniversary and it runs like I got it yesterday.


I've even turned down offers for cheap lipos from chinese manufacturers because their quality control is well.. complete crap and I won't risk the safety and wellbeing of my fellow racers because I wanted to save a few dollars. Health over price. always.

I've had polyRC, common sense, GWS, apogee and maxamps packs. for good manufacturers I would go with Kokam, and Enerland based packs.
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Old 06-21-2008, 10:11 AM   #80
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And Enertech if they start doing larger packs for the car market. :-)
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Old 06-21-2008, 10:36 AM   #81
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Here is the thing I donít understand Lipo was going to be the great savior and you would only need 1 pack for racing all day. Yet I still see people with 4 or 5 lipo packs.....it doesnít make any sense to me. Right now I have 1 lipo pack that I use all day 6 or 8 charges a day. And you know what by the end of the day the thing is faster then when I started the day. So I have 1 100 dollar lipo pack and not 4 or 5 100 dollar lipo packs so when this one pack starts to show any signs of slowing down I will just go buy another pack and repeat the process all over again. And guess what at the end of 2 or 3 years Im sure I will have spent less money then someone who has 4 or 5 packs and charges at 1C.
where i race, most people have 1 or 2 lipo packs. i have 2, mostly for practice reasons, i don't like to run more than 6 minutes on a pack. during races there is more than enough time between heats to re-charge.
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Old 06-21-2008, 05:46 PM   #82
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Here is the thing I donít understand Lipo was going to be the great savior and you would only need 1 pack for racing all day. Yet I still see people with 4 or 5 lipo packs.....it doesnít make any sense to me.
More money than brains syndrome.

no one needs more than two or three packs for a full day.
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Old 06-21-2008, 07:17 PM   #83
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Okay, I feel the need to clear up one thing in this thread:

If you are charging through the output jacks, there is NO way to tell the voltage of each individual cell in the pack. This is only possible if you are charging through the balance connector.

Now, carry on.
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Old 06-21-2008, 08:59 PM   #84
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To answer the first post ...

I love lipo and will never run nimh again unless required by class. Buying nimh is a waste of money.
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Old 06-21-2008, 09:13 PM   #85
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Agreed. I REALLY want to get into 12th pan car, but do not want to purchase any NIMHs. 10th pan car will fit LiPO, but locally they still require 4 NIMHs to keep costs and speed down. There are other ways to do that, and LIPO in the long run can be much cheaper.
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