PRC-77 Battery Replacement

Radio Telephone and Telegraph Transmitting and Receiving Equipment
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bazookajoe
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PRC-77 Battery Replacement

Post by bazookajoe » Thu Aug 09, 2018 5:03 pm

Well i followed the youtube video on how to make a replacement battery and got the same lead acid battery as in the video and charged it up....built the adapter and put it in and voila!!!!! nothing... Now i know the radio works fine and i even tested it on another 77.....is the 13.3 volts not enough to run the radio. Anyone else have this issue?

snock
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Re: PRC-77 Battery Replacement

Post by snock » Fri Aug 10, 2018 8:44 am

Are you sure it's a 77? I run two 6V lead acids in series in mine and everything is fine. If it's actually a 25 (open it up and look for the single vacuum tube), then it's not going to work. Past that you have the wrong pins wired and/or wired backwards. Follow the markings on an original battery for the proper connections.
1989 M998
1964 M151 w/1967 M416
1986 M1009

fnp43
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Re: PRC-77 Battery Replacement

Post by fnp43 » Fri Aug 10, 2018 9:53 am

I agree with Snook I can run my PRC77 on a 12 volt lead acid cell used for alarms but it wont fit in the battery box If you have a PRC25 it wont work because you need a separate 3 volts for the filament of the tube You might look and locate a BB586 which is the rechargeable NiCad battery for the 77 They arrnt too common I have to replace some cells in mine
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