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Old Mar 17, 2012, 03:19 PM
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Data
Which discount batteries are worth the money?

So with the huge number of various Lipos coming out of China under various brand names and prices, I thought we should share our experiences with these batteries via real data.

Purposes format is:

Brand name:
Size:
C rating:
Place of purchase:
Price:
Number purchased:
(Insert picture)

Test data:
Number of cycles at test:
Size/type of aircraft used in:
Approx flight time:
Voltage when amps drop to low for flight:
Voltage in each cell:
Approx temp:
Amount of swelling:
Are they worth the price?
Do you trust them not burst into flames?
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Old Mar 17, 2012, 03:32 PM
Frankenstein recycled packs
rampman's Avatar
USA, AZ, Gilbert
Joined Jan 2006
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Brand name: Been discussed
Size: Been discussed
C rating: Been discussed
Place of purchase: Been discussed
Price: Been discussed
Number purchased: Been discussed
(Insert picture)

Test data: Been discussed
Number of cycles at test: Been discussed
Size/type of aircraft used in: Been discussed
Approx flight time: Been discussed
Voltage when amps drop to low for flight: Are you kidding me?
Voltage in each cell: Been discussed
Approx temp: Been discussed
Amount of swelling: Been discussed
Are they worth the price? Been discussed
Do you trust them not burst into flames? Been discussed
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Old Mar 17, 2012, 03:34 PM
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Brand name: Troque R/C pack
Size: 3S, 2200 mah
C rating: 25
Place of purchase: ebay
Price: $10.46
Number purchased: 3


Test data:
Number of cycles at test: 5
Size/type of aircraft used in: 450 heli
Approx flight time: 6-7 mins of hovering
Voltage when amps drop to low for flight:
Batt #1 - 9.48
Batt #2 - 9.39
Batt #3 - 10.16
Voltage in each cell:
Batt #1 - 3.15, 2.93, 3.36
Batt #2 - 2.97, 3.36, 3.04
Batt #3 - 3.38, 3.38, 3.38
Approx temp: warm to touch
Amount of swelling: slight and goes away after cooling
Are they worth the price? Still to be determined
Do you trust them not burst into flames? Swelling and unbalanced discharge has me worried enough to us a fire proof security box while charging.
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Old Mar 17, 2012, 03:36 PM
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[QUOTE=rampman;21062603]Brand name: Been discussed
Size: Been discussed
>>>>

Then please post some links.
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Old Mar 17, 2012, 03:38 PM
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+1 Rick!

I would append... ad nauseum
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Old Mar 17, 2012, 04:20 PM
Southern Pride
everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
34,361 Posts
Quote:
Voltage in each cell:
Batt #1 - 3.15, 2.93, 3.36
Batt #2 - 2.97, 3.36, 3.04
Batt #3 - 3.38, 3.38, 3.38
Another die hard LiPoly abuser.

If one is going to abuse them as such then best advice is to purchase the leasst expensive ones available.

Charles
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Old Mar 17, 2012, 04:22 PM
Expo/DualRates = Lack of Skill
typeRA's Avatar
San Diego, CA
Joined Mar 2009
789 Posts
You are killing these batteries!

Quote:
Originally Posted by fosjef67 View Post
Brand name: Troque R/C pack
Size: 3S, 2200 mah
C rating: 25
Place of purchase: ebay
Price: $10.46
Number purchased: 3
Test data:
Number of cycles at test: 5
Size/type of aircraft used in: 450 heli
Approx flight time: 6-7 mins of hovering
Voltage when amps drop to low for flight:
Batt #1 - 9.48
Batt #2 - 9.39
Batt #3 - 10.16

Voltage in each cell:
Batt #1 - 3.15, 2.93, 3.36
Batt #2 - 2.97, 3.36, 3.04
Batt #3 - 3.38, 3.38, 3.38

Approx temp: warm to touch
Amount of swelling: slight and goes away after cooling
Are they worth the price? Still to be determined
Do you trust them not burst into flames? Swelling and unbalanced discharge has me worried enough to us a fire proof security box while charging.
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Old Mar 17, 2012, 04:35 PM
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Quote:
Originally Posted by typeRA View Post
You are killing these batteries!
I agree, but correct me if I am wrong, shouldn't they discharge a little more balanced. And if so should I be worried about them going up in flames during use? I have two small 2S eflight lipos that discharge prefectly balanced down to about 3.14 volts in each cell before the amps drop off. With that is 3.14 volts to low?
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Old Mar 17, 2012, 04:42 PM
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So. Cal.
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Quote:
Originally Posted by fosjef67 View Post
IWith that is 3.14 volts to low?
Yes, conventional wisdom is that anything below 3.7V/cell resting is doing no favors for your lipoly investment.

Mark
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Old Mar 18, 2012, 12:54 AM
Frankenstein recycled packs
rampman's Avatar
USA, AZ, Gilbert
Joined Jan 2006
8,572 Posts
Quote:
Originally Posted by fosjef67 View Post
I agree, but correct me if I am wrong, shouldn't they discharge a little more balanced. And if so should I be worried about them going up in flames during use? I have two small 2S eflight lipos that discharge prefectly balanced down to about 3.14 volts in each cell before the amps drop off. With that is 3.14 volts to low?
Been discussed before. LOL.
Actually, when a cell is below 3.6 volts it is basically at 1 or maybe 2 percent. Regardless of actual % left, it is empty. Packs never discharge that low evenly, ever. If overdischarged, as yours were, it is expected to have at least one go much lower than the others. If you put a % to this one can say the cells are only .1 % off. Empty is empty, just one/some are more empty than the other/others.

Rick
Disclaimer, all numbers are just numbers, not hard facts BUT are pretty close to exact...
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Old Mar 18, 2012, 08:50 AM
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So, taking everyone’s advice I decided to check and see what the actual cutoff voltages on my ESC were. I had programmed for middle which turns out to be 2.85 volts in each cell. Now that is under load, but from what everyone is saying that is still spelling doom for my lipos. My ESC is now re programmed for High, which is 3.1 volts in each cell. My ESC does not monitor each cell, but hopefully this will still help out. The real question is why do they set the voltages so low on the ESCs, if it is not good for lipos? I would have expected the Low setting to be around 3 volts, instead it is 2.6.

On another note I had not realized that the throttle range had to be set on the ESC (it is now set). Guess I should have read the instructions more carefully!


Thanks for the input, I am still new to all this but learning fast. Gas and go was alot easier to figure out on my old U-control. R.I.P Cox PT trainer.
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Old Mar 18, 2012, 02:34 PM
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Echt, Netherlands
Joined Aug 2003
3,000 Posts
Quote:
Originally Posted by fosjef67 View Post
So, taking everyone’s advice I decided to check and see what the actual cutoff voltages on my ESC were. I had programmed for middle which turns out to be 2.85 volts in each cell. Now that is under load, but from what everyone is saying that is still spelling doom for my lipos. My ESC is now re programmed for High, which is 3.1 volts in each cell. My ESC does not monitor each cell, but hopefully this will still help out. The real question is why do they set the voltages so low on the ESCs, if it is not good for lipos? I would have expected the Low setting to be around 3 volts, instead it is 2.6.

On another note I had not realized that the throttle range had to be set on the ESC (it is now set). Guess I should have read the instructions more carefully!


Thanks for the input, I am still new to all this but learning fast. Gas and go was alot easier to figure out on my old U-control. R.I.P Cox PT trainer.
Most ESC offer now other settings. Your looks like a Turnigy ESC, which also offers 3.1 volt and some of them offer 3.2 volt as well (85 ESC of them).
Jeti/Hacker had also as default 2.85 which is indeed low....

The CC controlers offer USB cable and own setting. I use then 3.3volt per cell, but 3.5volt is even wiser.

Anyhow, if LiPoly is empty... 'nothing is left' anymore. Unlike NiMH cells. So wise to fly on time. Good for keeping planes in one piece.
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