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Most lithium small radio batteries are 3.6 volts. If AA or AAA batteries, multiply by 1.5 volts. 4 batteries = 1.5 * 4 = 6 volts MAXIMUM. Rechargeable batteries are 1.2 volts. Your charger would be a much higher voltage because it takes power to "push" the charge into a battery. You didn't say, so I am assuming you want to operate the radio with a wall charger. I've done this by soldering the wires to the battery contacts. You need a higher voltage than 3.6 volts, but milliamps is more important. You need enough milli amps to get the radio to transmit. Too much and it frys, literally. So, this is all on you to decide if the risk is worth it. I use a 5-6 volt power supply set on no more than 1 amp (800 ma is my favorite size) 1 amp = 1000 ma. Let us know if this helped!
Well, any radio could do Morris Code. The question really is how. Handheld radios would need to be hooked up to an input device to take the place of a Morris Code "key". The person listening needs to hear the dit, dit, dit, dash, dash noises. I am not certain if that is what you want from an FRS radio. It would take some cobbling together. What is your goal?
This was extremely difficult to find but I have located the manual for you on these walkie talkies. It will be easiest to just use the manual and follow the instructions. If you still have questions or problems please respond here and I will get back to you. Please rate my answer 4 thumbs up here on the site, it is very important to me. I would be forever grateful. Here is the manual: