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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › JR battery question
03-05-2008 12:45 PM  10 years agoPost 1
George Matthews

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N.W. Ohio

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Here is something interesting.
I purchased a JR NiMH 2300 maH 6V rx battery and a slip of paper that came with the battery said to use a JR NEC-222 wall wart charger for the first few charge cycles.
The problem is that the NEC-222 charger only outputs 5.8 volts on the RX side. Althought the output maH rate of 150 maH is ok for a slow charge it would seem that the 5.8 volt output would be too low for a 6v battery.
Any thoughts on this?

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03-05-2008 01:02 PM  10 years agoPost 2
SteveH

rrProfessor

Texas

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Don't know about voltage output of that charger, but you definately want to slow charge (c/10) a NiMH battery several cycles when it is new. I'd try the charger and use a milliampmeter to check the charge current.

The government cannot give you anything without first taking it from someone else.

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03-05-2008 01:17 PM  10 years agoPost 3
George Matthews

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N.W. Ohio

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Yeah I plan on performing several slow charge cycles.
But when I use the JR NEC-222 charger to charge this 6V pack I notice the LED on the charger glows very dim. But when I charge a 4.8 V pack the led glows much brighter.
So I don't know if the 5.8V output of this charger is enough for a 6V pack.

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03-05-2008 01:27 PM  10 years agoPost 4
Dr Lodge

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Guildford, Surrey - UK

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I doubt a 5.8v charger will charge a 6v pack. You'd need something capable of 7 volts or slightly higher.

Vibe 90, Vibe 50, Vigor CS x2,
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03-05-2008 04:34 PM  10 years agoPost 5
pchristy

rrApprentice

Devon, England

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Don't mix up average with peak voltage!

It is not unusual for basic mains chargers to use half-wave rectified current because 1) its cheaper to manufacture, and 2) NiCADS respond better to it (it helps break up the crystal whiskers that are a cause of the "memory" effect)

A half wave rectified charger will give a low reading on a moving coil (analogue) type meter, because that measures average voltage. However, the PEAK voltage will be a lot higher, and can still be sufficient to charge the pack properly.

Measure the current with the pack in circuit. You will probably be surprised!

--
Pete

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