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The Evil Cadmium is still around!

The Evil Cadmium is still around!

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It's hard to believe that at the end of 2019 you can still buy NiCd AA batteries. You can.
I have been using NiMH AA/AAA batteries for the last 20+ years. This experimental NiCd pair is for a higher drain application where NiMH seem to perform worse after ~50 recharge cycles. NiCads should be better. On the other hand, with their funny 600mAh capacity (actually 1/3 or 1/4 capacity of modern NiMH AA batteries), more frequent recharging will be needed.
They'll be properly recycled at the end of their life and their cadmium won't end in the sea.

thermo_final_lg.jpg strangeobj.jpg nicd.jpg voltage.jpg

Light Information

Light Information

Manufacturer:Panasonic (after Sanyo acquisition)
Model Reference:Cadnica N-600AAC
Electrical
Wattage:600mAh capacity
Voltage:1.2V
Physical/Production
Factory Location:2014-2016 (or newer) according to datasheet date

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Date added:Nov 11, 2019
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Date Time:2019:11:11 18:54:08
DateTime Original:2019:11:11 18:29:39
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sox35
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Jan 19, 2020 at 04:20 PM Author: sox35
From what I understand they're still available as replacements for emergency lighting fittings, I have a relatively recently made NOS 8W T5 fitting with one in. Someone told me that they will probably have to keep them available for this purpose for some time, as if there were an emergency and all the emergency lights didn't work, people might not be very happy and start suing all over the place..!

Ria in Aberdeen
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nogden
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May 15, 2020 at 11:27 AM Author: nogden
They're still pretty readily available here in the USA. My experience is that they hold up better in cold weather compared to NiMh, so I still buy them for my flashlights where I don't mind recharging them a little more often.
sox35
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May 15, 2020 at 11:35 AM Author: sox35
The main problem with them is the dreaded "memory effect" where if you recharge before fully discharging them they forget their full capacity
NiMH has a similar problem, but not as bad as NiCd cells.

Ria in Aberdeen
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May 15, 2020 at 11:43 AM Author: nogden
I've heard of the memory effect but never actually experienced it.
sox35
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May 15, 2020 at 11:47 AM Author: sox35
It's a pain. I first came across it in my early days of amateur radio, the handheld radios used them and unless you fully flatten them every single time, they slowly but surely lose capacity. The radios we have currently use NiMH and aren't so bad, but we still only generally get 3 or 4 years life at the most out of a battery pack, and they cost serious money to replace

Ria in Aberdeen
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nogden
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May 15, 2020 at 11:50 AM Author: nogden
The biggest problem I've experienced with both NiCd and NiMh is when they develop a high self-discharge problem. I can charge a cell, discharge it immediately, and it will have near its rated capacity. But if I let the cell sit for a week or so, I might not get anywhere near its rated capacity. Sometimes they'll even short so I have to hit it with high voltage and current to blast the short away only to have it short again in a few days.
sox35
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May 15, 2020 at 11:54 AM Author: sox35
Yeah I've had that problem too

Ria in Aberdeen
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merc
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May 15, 2020 at 02:03 PM Author: merc
These NiCd suffer from the same problem as most of my NiMh (maybe except Eneloops). After some 20 or 30 cycles, their capacity at 100mA discharge current is still higher than rated (over 730mAh) but they are "soft". With 1A load, their voltage immediately drops to insufficient ~1.05V and then goes even lower.
Maybe it's my POWEREX MH-C9000 recharger what shortens the battery life?

As for the "memory effect", see this Medved's reply.
nogden
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May 15, 2020 at 03:46 PM Author: nogden
The MH-C9000 should do a good job for you. I've had one for years and love it! I cycle my Cadnicas in it about every two months.
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