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Hand held multiband submersible radio. Variants include the VX-6r and VX-6e.

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Yaesu VX-6 battery pack (FNB-80LI) rebuild

…I’m actually surprised this radio was listed.


According to https://www.youtube.com/watch?v=di9keDlO... , this battery pack contains 2 x 18500 li-Ion cells, which sounds like a LOT better of a deal than the $70 replacement amazon wants to sell me.


However - the “scratch until you can open” method of getting in doesn’t feel… right?


Both halves of the FNB-80LI shell seem to be the same plastic. The battery pack in linked video seems to be missing a gasket - mine is a lot easier to take out than his seems to be.

Any suggestions with how to get this thing open?






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Hi @sudrien ,

I've about an 75% success rate with opening plastic welded cases with minimal cosmetic damage, by using a 1.5” paint scraper (the sharper the blade the better) and placing it along the long edge "seam" of the case (if it has one) and then giving the handle of the scraper a short sharp tap with a hammer to crack open the seam. If it splits open then after that you can open it further by using an old credit card etc.

Use the video you posted to know which side the pcb may be situated so as to stay away from that side if you decide to try this method

The inside lip of the seam may crack and break but this will not be seen when the case is closed again.

The other 25% of the time the case cracks and will have to be repaired somehow (superglue is not good with a lot of plastics, I’ve found that it actually melts some plastics) but there are plastic adhesives available or you could even tightly wrap a strip or two of black electrician's tape around it to keep it secure.

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Did the same without knowing about this and the video!

I kept cutting over and over the same trace but applying slightly more force at the corners. At some point, the cutter got through then everything was easy altough I used my spot welder to reconnect the batteries to the BMS. I regreted, it was a pain in the... Better to keep the tabs and solder on them. Cheers, Adrian YO3HJV

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Hi @sudrien

Just some suggestion you can try

https://www.youtube.com/watch?v=a00esZ3B...

use with care.

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The only difference was that my radio is a Yaesu VX-7R. But will be basically the same procedure for both radios. Slowly and carefully keep slicing until you have gotten thru. And not too deep. That’s what I did was with my power supply set to 3.7 volts I held on to the terminals on the battery, not the connections for like 30 - 40 seconds (You have to go direct to bypass the board.) Until I got somewhere like 3 volts in the battery I did it with both of them. Then put back gasket attached to the radio and now charging on the screen. And now you have working batteries, without replacing. And it will work on all your electronics with rechargeable batteries as long as the batteries have some life in them.

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For people who have swapped the cells, do they charge and work as expected? I've tried to re-cell some laptop batteries and never got the charge level to work right again, the BMS seemed stuck on the old broken capacity.

Also has anyone has tried putting 14500 LiIon batteries in an FBA-23 case? The FNB-80Li is rated 1500mAh, and 14500s would be about 1000mAh but it would only cost about $50 for the FBA-23 and two cells. Additional cells are about $7/pr. It seems like this would give you full power, since the radio is only using the voltage to determine the power source.

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I am going to try FBA-23 + Lithum 14500. Will let you know the result soon. VR2NG

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Sudrien Nei さん、ありがとうございました！
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