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Overcharged NiCd Batteries?
Hello,
I recently built a handyboard and bought a set of 8 1000mAh NiCd batteries
for it. I charged the batteries using the handyboard and a 12V 500mA DC
adapter from radio shack. I only charged the batteries for approximately 12
hours, and they seem to work fine. However, when I measure the voltage of
the batteries, it's higher than 9.6 volts, when they dont work any more. I
then tried a charger that charges at 150mA and left it on for approximately
16 hours. The charger had not turned off yet when I stopped charging. The
batteries measured over 11 volts with no load. After draining the batteries
once again, I measured the voltage when I had the handyboard turned on. It
measured 7.8V. When I turn it off and unplug the batteries, the voltage
slowly rises to 9.4V. Is this normal or should I get new batteries? I was
also wondering if the 500mA power adapter is adequate for the 1000mAh batteries.
Thank you for your time,
Jeremy Overesch
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Message has 1 Reply:
 | | Re: Overcharged NiCd Batteries?
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| Jeremy, You hooked it straight to a 12V power supply? That's kind of a brutal way to charge NiCad's. Who knows what that's going to do. If it's regulated at 500mA, then it should take just a little over two hours to charge a 1000mAh pack, which is a (...) (22 years ago, 9-Apr-02, to lugnet.robotics.handyboard)
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