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 Post subject: Nicad Battery Charger with NiMH Batteries.............
PostPosted: Tue May 15, 2018 8:16 pm 
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Joined: Sat Aug 12, 2006 4:17 pm
Posts: 1286
I have an old ARCHER 23-133A Nicad Battery Charger.
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It will Trickle Charge 4 or 2 AA Nicad Batteries at 2.9V 50ma for 14 to 16 hours.

The old Nicad Batteries I currently have are just about completely spent, and are no longer taking much of a charge.
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{They're 20+ years old now.} :lol:

Any way, the Nicad Charger is still functional, but I'm wondering if I could use it with AA NiMH Batteries?

I found some 4 packs of AA NiMH 400mAH for $3.50.
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It would be nice if I could use the old Nicad Charger with them, without having to modify it first.


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 Post subject: Re: Nicad Battery Charger with NiMH Batteries.............
PostPosted: Wed May 16, 2018 4:28 am 

Joined: Fri Aug 22, 2003 12:01 am
Posts: 1626
Location: (somewhere), Afghanistan; from Rochester, NY
What is the mAH rating of the cells? (AKA "C")

spec sheets for two manufacturers and Wikipedia say Trickle charge (no delta temp or delta V) at 0.1 times mAH, or less, is safe. (0.1 x C)

If your charger really is limited to 50mA max, it should be okay.

Cheers,



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 Post subject: Re: Nicad Battery Charger with NiMH Batteries.............
PostPosted: Wed May 16, 2018 12:42 pm 
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Joined: Sat Aug 12, 2006 4:17 pm
Posts: 1286
dyarker wrote:
What is the mAH rating of the cells? (AKA "C")

Sorry, I forgot the H in the NiMH battery rating, so it should read 400 mAH.
dyarker wrote:
spec sheets for two manufacturers and Wikipedia say Trickle charge (no delta temp or delta V) at 0.1 times mAH, or less, is safe. (0.1 x C)

If your charger really is limited to 50mA max, it should be okay.

Cheers,
Yeah, the 50mA max is right.
Okay then, I'll give these NiMH Batteries a try.

I've got an old Polaroid Digital Camera that just eats AA batteries like a pig.
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Even though the camera isn't technically turned on, it seems to be drawing about 1-to-5 ma.
Thus, when I'm not using it, I take out the batteries.
Because if I don't, the next time I need to use the camera.
I'll find the batteries are completely dead.

Thanks dyarker.


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 Post subject: Re: Nicad Battery Charger with NiMH Batteries.............
PostPosted: Wed May 16, 2018 1:25 pm 

Joined: Fri Aug 22, 2003 12:01 am
Posts: 1626
Location: (somewhere), Afghanistan; from Rochester, NY
At 400mAH, 50mA trickle would be 10mA over.

The AA size NiMH cells I saw at Digikey were 2300mAH and 1900mAH (2.3AH and 1.9 AH). I thought the 400mA in your first post was the max discharge current, not the Amp Hours rating.



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