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ContinuousWave: Small Boat Electrical
NiCd vs NiMH Rechargeable Batteries?
|Author||Topic: NiCd vs NiMH Rechargeable Batteries?|
posted 07-06-2008 09:46 AM ET (US)
What is the difference between NiCd and NiMH rechargeable bateries ? I have 6 SAFT NiCd rechargeable AA batteries in my Icom IC-M3A VHF Marine Transceiver(Radio). These batteries came with the radio to my surprise. Is NiCd SAFT company trademark? Can I use NiMH batteries to replace. I know I can use alkaline.
posted 07-06-2008 10:55 AM ET (US)
Icom gets points for using standard cells and not making
you buy a $100 battery pack.
NiCD = Nickel Cadmium
NiCD is obsolete technology. I think the best AAs were
Now, can you replace NiCD with NiMH. They are roughly the
I've personally not run into this problem.
Both NiCD and normal NiMH batteries will self-discharge by
two for my underwater strobes
posted 07-06-2008 08:57 PM ET (US)
As always...thanks Chuck. The charger that came with the radio plugs into the radio. I do not have to remove the batteries from the case. The charger is described as an AC adapter (BC-131A)
posted 07-06-2008 11:39 PM ET (US)
Newtauk - one BIG difference is that the NiCd cells have a memory - they work just like our kids - if you don't make them work, they won't. That is, if a NiCd is used for a couple of hours and then charged - that is about all the "work" that you can ever get from the battery - unless it is totally discharged and then start over. But, like Chuck mentions - the NiCd cells are about "history".
As far as I know - the NiCd chargers cannot be used for the NiMH cells - as they have different charge/discharge characteristics. But it has been long time since I have bought NiMH cells or chargers.
The bulk of the NiMH batteries and chargers I have came from Radio Shack - and I have been really impressed by their performance. ----- Jerry/Idaho
posted 07-07-2008 10:11 AM ET (US)
Unless your iCom radio states it is ok to charge NiCads or NiMH cells then I would recommend that you either stick with NiCads or get an external charger for the NiMH cells. Using the NiMH cells in the radio should not be a problem but the charging control within the radio may not be compatible. With a proper external charger you could also consider LiIon cells for even more life.
posted 07-07-2008 12:01 PM ET (US)
I haven't seen any LiIon AAs. And LiIon cells are about 3V.
The M3A manual says it takes 15 hours to charge the NiCDs, so
NiCD "memory" is a very overrated problem. I used NiCDs for
posted 07-07-2008 09:19 PM ET (US)
Chuck's right. I've had very similar experiences. I have used Duracell batteries (AA and AAA)and a Duracell quick charger for years now. I'll bet I have 24 AA maybe more and at least 12 AAA. I made a trickle charger for my batteries too. Marine handheld, 2 GPS units, RC Sailboat, Xbox and Wii remotes, all use them.
Chuck did the math correct, too. I'll bet with the right information he could tell you EXACTLY when your batteries are fully charged. I could too but not now. My brain is fried.
My West Marine radio came with a NiMH battery pack with a typical trickle charger and a battery "tray" that can use any AA batteries. I carry the loaded tray fully charged in a plastic bag in my ditch box.
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