Some times contacts on the battery get an invisible film preventing them from making good contact. Take the battery off of the radio and use a pencil eraser on the battery contacts and on the radio contacts then put it back together and see if that helps.
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Re: ICOM IC-F11
Are you sure if the battery is working fine? how old is the battery?
The problem can be on the batery the have several bateries inside and if one of these bateries is dead the batery will show this kind of syntoms
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The Batteries that Motorola uses will die after a while mainly because people leave them on the charger all of the time. But there is a way to refresh them. You let the battery die completely, then you charge it up for about 12 hours. Then you let the battery die completely. Do this a couple of times and the batteries will last long. Also, Motorola use to make a battery refresher (or did when I worked there.) It will charge and drain the battery automatically. It will even give you a fault if the battery is completely dead. For the HT1000 (for example) it would be the WPPN4065BR. For future reference, don't constantly charge a battery. Only have it on the charger when the battery is actually dead or very low. This will increase battery life.
Sounds like an intermittent problem. Was the radio ever dropped or water damaged. I would have to open the radio to check for damage. I think i'ts a good idea for a tech to look at it. The IC F21S is an inexpensive radio you might just want to buy a new one. A tech will charge you around $65 just to look at it and a new on is around $129.00. I list on ebay every once in awhile a repair special for $32.00. But is depends on the problem. Carl
This applies to all battery powered radios. Take out the battery and measure the voltage to see if it is indeed charged. If it's not, then the fault is the charger or the battery or both. If the battery voltage shows that it is fully charged, then clean the terminals on the battery and on the radio with a pencil eraser to remove any corrosion. If still no joy, then look up in your user's manual on how to do a reset. If you don't have a manual, get on the ICOM website and download one.