lipo電一問

A係energy
V係power
咁C係咩?

回復 jerwin123 的帖子

mAH係電池容量
V係電壓
C我都唔知係點定義,但我將佢理解成連續可放電流量.

My understanding:

1C = 電池容量 (e.g. 5,600 mAH)
The C value on batteries indicates the number of C's that can be drawn from the battery in an hour (please correct if I am wrong).

and what is the different between C and mah??? they seem to be the same...

If you multiply the number of C's with the capacity of the battery, you get mAH.

Capacity, they indicate in mAH.
Rate at which energy can be drawn, they indicate in C's.

Both are measured in mAH as unit.

Example: 5,600 mAH, 50C batter means:

A maximum of 5,600 x 50 = 280,000 mA = 280A can be drawn from the battery in 1 hour.

I think that's roughly it

Sure other c-hings can give you a more accurate description.

Thanks Ching!!!

The C rating means the discharge rate (or charge rate).  For example.  a 5600mah, 50C battery.

You can discharge it at 5.6A (5600mA) for 1 hour.  The max discharge current is 5.6A x 50C= 280amp.  BTW:  as Lipo cannot discharge to 100% without damaging it.  So don't try to discharge it at 5.6A for 1 hour.....  If you discharge this pack at 280A in theory the battery will only last around 72 seconds......

Welcome, although how they work out the C values, and put the "50C" and "65C" labels (+ hefty price tag) on the batteries is still a mystery

Battery factory do have loads to test the battery at these kind of crazy load.  But to be hornest the most important point is how it "feel" when you drive it.  Right?  

Yes, yes. As I am a slow driver, 爆 or not doesn't matter that much to me.

On another point, can someone tell me:

- The ESC controls the voltage supplied across the motor
- The motor's resistence determines the current of the circuit (V= IR so I = V/R)

So current depends on the motor. That's why the RC shop says, for fast motors, you need batteries with higher C values.

But what happens if I put a battery with low C values with a fast motor? Will the motor still work? If so, what's the effect on the battery? Will it puff or die?

jerwin123 發表於 2011-8-23 13:49

                               
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A係energy
V係power
咁C係咩?

mAh係表示電池的容量，數字越大，舊電越襟行。

V當然係電壓啦，數字越大表示入面越多cell，架車越快。

C就係表示舊電可以出幾多電流，呢個數字要同mAh一齊睇。例如一舊5000mAh，30C電池可輸出5x30=150A電流而唔會即時打柴。一舊電可以高mAh低C，即係舊電好襟用，不過要斯斯文文用；又可以係底mAh高C，即係舊電可以粗粗魯魯用，不過好快用完。

至於一舊5000mAh既電係唔係可以連續一個鐘頭輸出5A呢？答案係唔一定。呢個數字只係表示響"特定"電流下，該電池可以輸出5000mAh的電量而電池的電壓可保持在"一定"的數字以上。該"特定"電流及"一定"電壓就要睇返該電池的產品規格。如果不是用該"特定"電流放電，該電池是未必可以放出5000mAh電的。

Allan007 發表於 2011-8-23 17:40

                               
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mAh係表示電池的容量，數字越大，舊電越襟行。

V當然係電壓啦，數字越大表示入面越多cell，架車越快。 ...

thx, 好詳鈿

Allan007 發表於 2011-8-23 17:40

                               
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mAh係表示電池的容量，數字越大，舊電越襟行。

V當然係電壓啦，數字越大表示入面越多cell，架車越快。 ...

Thanks for your information....

回復 cherwowo 的帖子

C-Hing, see my response for your information.

- The ESC controls the voltage supplied across the motor - More or less
- The motor's resistence determines the current of the circuit (V= IR so I = V/R) - Not really

So current depends on the motor. That's why the RC shop says, for fast motors, you need batteries with higher C values. - That's true.

But what happens if I put a battery with low C values with a fast motor? Will the motor still work? If so, what's the effect on the battery? Will it puff or die?
The motor will draw a current which has exceeded the limit of the battery.  The motor will not run as powerfully as running on a high-C battery.  The battery's life will be shortened or it will "swell" shortly.