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› Peeve about Turnigy, Zippy etc.
08-12-2010 11:33 AM  8 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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THE LIFE AND PERFORMANCE OF A PACK SOLEY DEPENDS ON HOW WELL IT BALANCES FROM THE GET GO!! Forget about it being balanced within at the end of a charge that is irrelevant.

Instead of C ratings I would like to see cell imbalance figures when I am purchasing a pack and the packs being priced accordingly!!!!! It would not be difficult for the manufacturers to do this!

60% of the time, it works every time!

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08-12-2010 01:30 PM  8 years agoPost 2
LeszekJ

rrNovice

Poland

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A small addition.

High current kills cells by temperature rise.
They should publish internal temperature graphs also...

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08-12-2010 01:42 PM  8 years agoPost 3
Richardmid1

rrProfessor

Leeds, England

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That is a user misuse issue. If you buy a battery inadequate for the application that is your own fault. Cell imbalance is the manufacturers fault.

60% of the time, it works every time!

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08-12-2010 02:17 PM  8 years agoPost 4
LeszekJ

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Poland

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Is it a misuse if I draw 50C from a 50C battery?

What is your opinion: a battery is labeled 50C cause voltage vs. current or maybe cell temperature rise vs. current?

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08-12-2010 02:26 PM  8 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Depends on the capacity, 50C on a 2000mah pack is 100amps! If that application is drawing more than 100 amps then you would need a larger capacity pack.

If it is a 50C BURST pack then you should only be drawing 50C for no more than about 5 seconds.

60% of the time, it works every time!

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08-12-2010 05:51 PM  8 years agoPost 6
LeszekJ

rrNovice

Poland

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True, true.
Any ideas about my question?

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08-13-2010 02:13 AM  8 years agoPost 7
trunkmunki

rrApprentice

Bangor

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You can direct-short any battery and get HUGE current flows, for about a second. The limit becomes the meltdown of the pack. I would say it is more likely the temperature issue that generates the "C" rating, you may (will) get a voltage drop under load, but that is not the battery mfg's problem. It is up to you to determine if the output of a pack is sufficient to provide required voltage under all expected loads, it is up to the mfg. to tell you how much abuse the pack can handle before it goes pyro.

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08-13-2010 10:39 AM  8 years agoPost 8
Richardmid1

rrProfessor

Leeds, England

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I think going beyond a packs C rating drops the voltage below a certain critical value, 3v per cell is my guess.

Drawing 30C from a 30C constant pack the voltage will drop slowly till it reaches a certain level say 3.2v per cell, the same pack probably has a 60C burst rating which means at 60C current draw the voltage will drop faster and keep dropping below the critical level which is why it is a burst rating.

60% of the time, it works every time!

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