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05-29-2012, 7:46 PM
 Member Join Date: May 2010 Location: Itasca County, MN Posts: 32
Motorola radio battery with four pins?

Sorry if this seems like a stupid question, but could someone point out (if you know) which is negative and which is positive? Also, how many cells are in this battery? This is a battery for a Motorola CP110m

Thanks,

Vinny
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05-29-2012, 7:58 PM
 Member Premium Subscriber Amateur Radio Join Date: Mar 2008 Location: Michigan Posts: 843
Motorola battery

A little work with a multi-meter should answer the terminal question. For the number of cells, divide the total voltage of the battery by 1.2 (sometimes 1.25, depending on manufacturer) if it is a NiCd or NiMH battery to find your answer. The Motorola battery I have reads 7.5 volts, so it is a 6 cell battery (7.5/1.25=6).
05-29-2012, 8:24 PM
 Member Join Date: May 2010 Location: Itasca County, MN Posts: 32

Quote:
 Originally Posted by jaspence A little work with a multi-meter should answer the terminal question. For the number of cells, divide the total voltage of the battery by 1.2 (sometimes 1.25, depending on manufacturer) if it is a NiCd or NiMH battery to find your answer. The Motorola battery I have reads 7.5 volts, so it is a 6 cell battery (7.5/1.25=6).
...and If I don't have a multimeter?
05-29-2012, 8:30 PM
 Member Premium Subscriber Amateur Radio Join Date: Mar 2008 Location: Michigan Posts: 843
Motorola battery

If you are into radios and electronics, a multi-meter is a must. There are many values that can be tested, and I don't trust any new charger or power supply before I check the output and polarity with my meter. Reverse polarity or overvoltage can cause damage far in excess of the cost of a meter.
05-30-2012, 8:17 AM
 Member Join Date: Jul 2010 Location: SC Low Country Posts: 176

Quote:
 Originally Posted by derota ...and If I don't have a multimeter?
Everyone should have a meter!
You can buy one for less than the price of lunch at McD's so cost is not an issue.
In fact I use the Harbor Freight cheapo's even though I have a high dollar meter in the tool cabinet.
Multimeter - Harbor Freight Tools
Buy one, learn to use it!
Ron

 Tags battery four prong cp110m

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