Tip & How-To about Motorola MU21CV (1 Channel) 2-Way Radio
The M series Motorola radios such as the MU21CV, come equipped with a NiCD rechargeable battery. This battery when fully charged should operate the radio a full 8-10 hour business day. The batteries have a life expectancy of 18-24 months.
The original Motorola battery has a date code in the white box above the stop sign on the back of the battery. The first digit is the year, and the next two are the week of the year. Example: 919 would be 2009, the 19th week. (Unless very old and it could be 1999)
When replacing the battery it is important to install the battery correctly. Put the top of the battery into the radio first, then slide the bottom into place. This method will cause the least pressure on the internal battery contacts.
If you battery's contacts are dirty or filmed, simply clean them with a pencil eraser. Do not use solvents or a knife blade on the contacts. The radio's contacts can also be cleaned with a pencil eraser.
The wall adapter style charger which came with the M series radio can burn out over time (much like a lightbulb). Replacement chargers are available. If your charger light is flashing, you most likely have a bad battery. If your charger light does not illuminate, you have a bad charger.
Replacement batteries and chargers are available, as is repair of this style unit.
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