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Old 04-28-2005, 03:11 PM   #1
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Battery pack capacity

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I have a 600 mha pack for my Rx. When I cycle it, it shows its capacity of over 600. I just did it and it showed 636 mha? What they heck does that mean?

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Old 04-28-2005, 04:08 PM   #2
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What they heck does that mean?
I would think that means you have a good battery , although I have never seen mine after cycling go over the capacity of the battery (in the mah).
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Old 04-28-2005, 04:08 PM   #3
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It means your battery is still in great shape. Congrats. If it drops to less than 80% on discharge test, then it's time to replace the pack.
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Old 04-28-2005, 04:14 PM   #4
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I cycled a battery from one of my cordless phones rated at 300mah and my triton cycled it at over 400 mah. Weird.
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Old 04-28-2005, 04:49 PM   #5
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New batteries checking out higher than their ratings is quite normal.
If you cycle a new battery several times it will normally gain capacity each time and almost always exceed its rating.
80% capacity is really pushing your luck and I would retire that battery to my test stand or engine ignition before it falls that far.
The problem is not so much the lower capacity but rather the fact that a battery that poor can totally fail very quickly ie the rate of discharge is not proportional.
I know we have more informed battery experts on this site who can explain these basic battery facts better than I.
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Old 04-28-2005, 05:45 PM   #6
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Red Scholefield say that a cell is considered failed if it drops to 80% of its rated capacity but I have to agree with Kevin on this one.

If you do regular maintenance on your packs which includes a regular program of cycling them, you will notice the downward trend of the pack long before it drops to 80%. When I see this happening, I keep and eye on the pack as I know that it is starting to wear out and I will replace them. When you consider the cost of your plane and its related equipment, why take a chance when you can buy a new pack for $15 to $20??

With proper care, a battery pack can last several flying seasons. I have a pack that is 4 years old and it still cycles at slightly above rated capacity!
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Old 04-28-2005, 08:46 PM   #7
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There is some good info on battery cycling, charging etc on this site. Dave does give some good info on why some batts cycle higher or lower than others when new with different cyclers etc.
Have fun Brian
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Old 04-28-2005, 08:57 PM   #8
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Two other possibilities:

- Your Cycler may be out of calibration.

- if you start the discharge right after charging you will get a false reading. You must let the batteries rest for a few minutes before starting a discharge cycle. Most good Charger/cyclers will do this for you.

Let us know what you find out, It is nice to know what the problem was.

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Old 04-28-2005, 09:06 PM   #9
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No, never found the header. Without paying 60-70 bucks. Not!!!!

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Old 04-28-2005, 09:28 PM   #10
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Any suggestions for a good quality but inexpensive battery charger/cycler for RX/TX NiCad and NiMh batteries?
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