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5 cell NC batterie

Old 01-30-2006, 04:58 PM
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corsair01
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Default 5 cell NC batterie

How many volts must a fully charched 5-cell NC batterie have ?
Old 01-30-2006, 05:08 PM
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Red Scholefield
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Default RE: 5 cell NC batterie

While still on charge (connected to the charger) 7.25 +/- depending on charge rate.

Of charge open circuit voltage and after standing for some time 6.75 volts.
Old 01-31-2006, 01:01 AM
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corsair01
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Default RE: 5 cell NC batterie

Thx Red,

I have the following problem. I used to fly with 4-cells NC batteries with approx. 2300 mA. I always loaded them with 180 mA for about 15 hours. (180x15=2700mA). Now I switched to brandnew 5-cells NC with 2300mA. I've loaded them with 180 mA for about 30 hours and just got 5.99 Volt.
Is this normal or am I doing something wrong here ?
Old 02-01-2006, 05:47 AM
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JNorton
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Default RE: 5 cell NC batterie

Sounds like your chargers voltage output is not high enough. It charges 4 cell packs but not 5. While we basically think of using current to control the charging of NiCad and NiMh batteries the voltage still has to be higher than the cell count - approx 1.5 volt per cell minimum.
John
Old 02-10-2006, 01:17 AM
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corsair01
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Default RE: 5 cell NC batterie

Thanks JNorton,

I followed your advice and bought a new charger to see what it does(My old one needed to be replaced anyway).

After three decharge/charge cycles (I charged with 0.6Amp for 5 hours) the max voltages I could get is 5.85 Volts. Have I cracked up the batteries by the first charge or are they just bad ? I called the shop where I bought them and they will replace them, but I really want to know what the problem is.

Thx.
Old 02-10-2006, 06:11 AM
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JNorton
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Default RE: 5 cell NC batterie

A five cell pack should be around 6.75 volts fully charged. If you tried to use the pack before it was properly charged you could have unbalanced it. Do a form charge at C/10 for 14 to 16 hours followed by a discharge to .9 volts per cell (5*.9 = 4.5 volts). Repeat three cycles. The C/10 charge will bring the pack back into balance. It's worth a try.
John

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