Nice work. A small switch between the cathode of the Schottky diode and second positive lead of the battery would allow switching between standard and rechargeable batteries. Then you're not having to do any resoldering to change it later. Just a thought for anyone thinking of doing this mod to their own radio.
Hello Peter this seems to be an iCOM Disease. The IC-7300 does act up with the same Symptoms. I decided to replace the Battery inside my IC-7300 with just a simple Battery Clip soldered to the Mainboard to use regular 3V-DC CR-2032 Lithium Batteries "non rechargeable" because we know how long it would take to leave the Transceiver switched on til the rechargeable Battery ifs just 50% charged up. It takes FOREVER. Tnx again for another neat Video and have a nice Weekend. 73 de Uncle Guenter, DK5ONV 💯🙋♂
Thank you for the peek inside. I think in the long term it is better to have the diode. Radio's get sold and traded and the next owner may not know to use a rechargeable battery if it goes flat again. I am also glad that the radio does not mess up or ask you to change the battery every time it turns on.
Another interesting video, Peter. And a great idea for those of us who has some "adult" (in years) radios. As always, you explain very good so we all understand how you come to these solutions. Thank you for taking your time to make a video and show us. 73 LB5JG Asle
Nice work Peter and great short educational video Glad you showed us this very helpful. Also the MLA2032 is something I am going to look for to replace our HVDC control CR2032 batteries which I need to do every 3yrs. I will keep this in mind. Also thanks for the added schotkey diode
Awesome work & extremely useful for those of us who own similar radios ie IC-7300, IC-9700 etc & so many other radios & devices which use similar setups knowing we can use CR2025/32 (Non-rechargeable) & ML2032 (Rechargeable). Of course, would need circuit mods for an ML2032 to adjust charging current. Thanks so much for sharing, Peter & God bless!
It maybe a bit 'tackey', but I will mount the battery holder somewhere on the back of the radio where it is easy to access and not have to remove the cover everytime. Good video!
Top Arbeit Peter 👍🏻 wenn bei Icom so Leute sitzen würden wie du gäbe es so was nicht , das Gerät kostet ja nicht gerade wenig und dann solche Batterien traurig !
Peter, I would recommend you take a look at the BR2032 battery too. The medical device I work with contains a CPU board which came with the BR version. These batteries technically have less than half the capacity of a CR 2032 but the actual current drain of the RTC on the board is so tiny that I couldn't measure it with a standard Fluke 79. It turns out that batteries in these applications discharge not because of actual current draw, but because of shelf life expiry and thermal cycling in the equipment. The BR version holds a usable charge in these conditions much longer. So despite the lower mAh capacity, the BR lasts much longer than a CR. The BR is also not rechargeable so if I was going to replace the battery in my 7300 (and I think it needs it) I'd probably put something bigger but rechargeable, or I'd use a BR instead of a CR.
I've found that some devices start to get flaky when a 3V coin cell drops to 3V and below so a fresh battery would be in order for sure here...the clock circuit may not be so sensitive. I have the same issue with our 7300 and 9700 and am really disappointed in Icom for having changed their designs to use the smaller capacity batteries as it could have been so easy to do as they'd done previously in other radios. It would be very interesting to see how the rechargeable version would work. TNX for sharing Peter, another great job! 73 - Dino KLØS
Hi Dino, The internal INTERFACE REAL TIME CLOCK MODULE RX - 8801 SA / JE works down to 1,6V. That's mean the coin cell can drop a bit... Maxell specified charger for ML2032 uses 2-3mA charging current for charging the battery in approx 24h. So you need to adjust the resistor slightly down for a bit more current. Many uses the ML3032 even without a charging current modification. But a bit more current would definitely help. Thanks for comment 73
I believe ICOM were supplied a batch of faulty batteries that after a time no longer charge. I saw this issue on my IC7300 despite it being on every day. I had several of the required batteries as I already had to fix the same problem in my Xiegu X108G. Replaced the battery and no problems since in either radio. 73 Ed.
Peter I probably would have oriented the battery holder to either side since you were working on the bottom side of the radio. I suppose if the holder is tight enough then it shouldn't be an issue.
Another fine video Peter, too bad ICOM didn't think about this during their design process. I guess they expect their radio to be powered-on all the time...figures!
Hi Peter, I have done the same fix in my IC-7300; this radios have the same issue. I used a germanium diode AA119 to have less drop voltage. Thanks for your video my friend and compliments for your 50K subscribed. Best 73 de IW0HEX Pasquale
An easier and safer way to take the battery out would be to use a tiny scalpel or sharp razer knife and break the 3 spot welds on top and bend that terminal away that would make it easier and quicker to unsolder the other lead of the battery.
Hi Peter very interesting project on laptops or desktop PCs after 5 years I think the internal battery has to be changed Peter you keeping well and your family too
Interesting that you mentioned commercial users, like the marine radios. Icom's marine HF radios actually have a battery holder for the battery for the GPS state, so it's easily replaceable. Both my IC-7300 and IC-9700 have dead batteries, and I used the ML2032 cells in them.
did you change anything in the charge capacity of both your radios ? it will take a really long time to recharge a ML2032 with the current charge of a 1mA battery cell !
@@Aleziss Well, in IC-7300 charger, there's a 3V3 voltage line, with a L1SS400T1G diode in series, which should have around 0.6 V forward voltage drop at around 1 mA of current, and should prevent battery current from going back into the 3V3 line. Then, there's a 3k3 resistor in series with the battery, limiting the charging current. My calculations tell me that the expected charging current is around 0.8 mA, giving us some two weeks to charge the battery fully. Now in my case, the power supply is left on for say 6-12 hours a day, pretty much every day, so this isn't as big of an issue (but the radios still managed to kill the original batteries, immediately after warranties expired), however, for faster charging, the current limiting resistor would need to have its value reduced. On the other hand, many ML2032 manufacturers recommend maximum charging currents of 2 mA, which is still a charging time of a week, so I didn't consider the change to be significant enough to go try replacing the resistor. Now, this leaves the users who want to quickly charge the battery, and let the RTC run for long storage periods without a good solution. Perhaps a super-capacitor could be a better fit here? I didn't do any research in that direction.
@@TRXLab but how much current the 7610, 7300 or 9700 provide to the original 1mA battery to recharge it ?? is it enough to recharge a ML2032 ? thank you so much for the reply !
Hi Peter, interesting issue. Touching a CR2032 with bare hands can result in a trace of oil across the plastic leading to accelerated discharge. Codan 2110 radios have a memory retention battery. If handled correctly 10 to 20 years life. If handled without gloves maybe 5 years!
Hello Peter, I only recently came across your channel, you make interesting videos. Have subscribed to your channel now. Ic-9700 has the same problem but no backup battery can be found.
The 9700 battery is under a soldered down screening plate that needs removing first to gain access. An even more difficult job than removing the battery. I don’t know if bringing wires out from under a screening plate will cause problems. Sorry Icom designer, you are hopeless.
As a ham since 1976 and CB operator before I have seen and tried endless receivers. Superhet limitations were the challenges to overcome. Icom did milestone engineering hours to create what I call a sieve to catch a signal on the air. The 7600, the 7300 and the 7610 flagships are like nothing else. Yet a $20 satellite rx module or even a DCF found no place inside let alone attaching an external monitor with my friends who bought a 7610 refuse to attach a monitor even given a free one to use. Here in Australia we have ham's that give you UTC in am and pm yet supermarkets sell GPS enabled phones for under $30.
FLRig software, for the 7300, has the capability of automatically setting the rigs time via CAT every time the program starts. The function can be also be triggered manually. Of course this requires a computer connected and the correct time on the computer, which I achieve by using a Raspberry Pi with GPS module attached. Unfortunately this function isn't available for the 9700, at least on the version I'm currently using. I don't know if it works with the 7610.
It would extend the time using a CR2032, but once it is dead it is dead. The 1mAh battery didn't have a lot of capacity, but 200 recharges would be equivalent to 1 CR2032. The other option here could be a rechargeable CR2032, which are not expensive, and therefore no modifications would be needed other than installing the 2032 rechargeable in place of the original battery.
That is a very common issue on other units, as the IC-7300. A bad design from Icom, IMO, as they didn't take care of the usual pattern of use these rigs could have. I replace it with a larger one, also rechargeable, and that does the trick
both my 7300 and 9700 suffer from the exact same issue, manual state battery should fully charge in 2 days but even when I do this, radio lose time again. It would be nice that you show how to modify the charge level if we would like to replace with a rechargable cell ! tnx for the video
@@TRXLab radio can be off for many days at a time as I am not always using radios every day, I suspect that I have drain the batteries beyond what they can be recharged again, radios are 5 year old now. thank you for the reply !
Thank you so much, I want to modifiy my 4 Icom radios using the ML2032 battery. Plese confirm that I can install the bigger batteries in the IC7610, IC7300 and IC9700 without over current charging issues. Has anyone doe this so far? I don't wnat to further modify the radios but want to update to the higher recharing battery. Thank you.
Much easier to get at than battrry and change it than the same battery in the Icom 7300. A poor design for sure and should have been corrected when the Icom 7300 came out, but they did not correct it.
Isn't it dangerous for the components to put aluminum adhesive directly on the components? I would have put krapton before putting this adhesive on I'm not an electronics engineer but I would have used krapton first But I could be wrong good video !
No que a ICOM estava pensando ao colocar uma bateria insignificante nesses radios ? não queremos comprar um radio caro pra ficar trocando bateria toda hora , modelos antigos duravam 10 anos uma bateria sem precisar trocar
Good but fidlely mod. Your will also find the the Icom IC-9700 has the same battery and problem as mine one has developed that fault. The 9700 was used for at lest two or three hours alost every day, Then the 12.8v PSU was switched off after use, but after two years (then out of warranty) the Icom battery died. Can someone tell me the number of the diode used please.
Hello Peter. I am surprised you didnt mention the option of using a back up capicitor instead of the battery option. Would that in your opinion not be an option at all?? The job is a bit of a pig. Well done. Mfg Mike.
May be if the power consumption is not too big. Have not calculated it, but it is for sure the consumption is too high for the little batteries, so that is an indica.
