Lithium Ion batteries

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From: Karl Larsen (k5di@zianet.com)
Date: Fri Dec 05 2003 - 07:55:46 CST


        The tiny Yaseu VX2R handitalky uses a 1000 ma-hr 3.7 volt
Lithium battery. The Wallwort that you plug into the radio says on it
that it puts out 6 volts dc. So the Lithium Ion charger must be inside
the radio! And it is.

        Last year from Mouser I bought all the parts to build a National
Semiconductor all battery charger. I had to get some special devices to
mount the multiconductor surface mount chips in a manhatten contruction.
But summer hit and other things got in the way. Everything in this
charger can be surface mount. It is tiny stuff and that is how they got
it into the tiny radio.

        The thing that's really nice is that I do not need to remember
to plug in the charger last night. It only takes an hour to charge the
battery! The radio get warmer from use than it does charging.

        I will get busy and build this charger so I can charge large
Lithium batteries.

-- 
                      
               - Karl Larsen k5di Las Cruces,NM Az ScQRPions -


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