Hello Spongella... I saw a post of yours about replacing the memory battery in an Icom IC-28A, and the original battery still had a ~3.06v charge, but the thread was closed. I have an IC-28H and the original battery has the same 3.06 reserve , but I also want to replace it. I've seen conflicting info as to whether a temporary 3v battery must be wired in during the swap, or if it can simply be removed/replaced without bricking the memory circuit. How did you do yours? TIAJust completed this AF/RF signal tracer kit made by BD Electronics. Excellent assembly instructions, all parts included except a 9V battery. Took only a few hours (I work a little slowly hi hi) to complete. Very inexpensive. Excellent customer service. Very pleased with my purchase. Thank you BD Electronics
I wish I had an answer for you. My memory battery was stone dead when I replaced it. If you get ahold of the service manual you may find the answer. The original battery was tack welded in place and I replaced it with a battery holder with a small pigtail to make future removal easier. Attached is a picture I took before unsoldering the original memory battery. Geeze, that was five years ago, time sure flies. Hope this helps. 73's.
Thank you for the reply! In the original thread you wrote that the battery still had 3.06 volts, the same as mine is now, but it was actually dead?
FB, 73's OM. Glad it worked out for you.Thank you for the reply! In the original thread you wrote that the battery still had 3.06 volts, the same as mine is now, but it was actually dead?
Icom: - Icom 28A Memory Battery Replacement
I recently replaced the memory battery in an old Icom IC-28A that I got recently, and amazingly the old battery from '99 was still holding a voltage after 21 years, and still maintaining the radio's memories. But, to be safe, it was replaced. Have replaced many memory batteries in radios, all...forums.radioreference.com
If it was dead, and you replaced it and were able to reprogram frequencies, that answers my question. Many web pages and some Icom instructions say you must solder in a temporary 3 volt source to protect the memory circuit when you do the changeout. If not, they warn the memory circuit may have to be replaced, or sent to Icom for reprogramming (of course they wouldn't work on an old radio from the late '80s). My original manual for the radio just says to send it to Icom to change the battery.
In fact I used a coin battery holder and alligator clips to make a rig be able to connect it just below the battery tabs when I unsolder it, but haven't received the new BR2032 yet. Just a lot of conflicting info out there on these old radios, and I'm being very cautious because I've repaired several issues on mine, and it's working very well now. I think I'll still try to use the backup rig I made, and solder in the new battery. 73's Tom.
This is the new battery:
