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Battery swap Ni-Cad to Ni-Mh (not bike)

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chris-red
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Joined: 21 Sep 2005
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PostPosted: 11:52 - 17 Sep 2018    Post subject: Battery swap Ni-Cad to Ni-Mh (not bike) Reply with quote

I have a battery pack it is 1900mAh @7.2v Ni-Cad it is ancient and mostly dead.

I've taken it apart and the cells inside are the same size as a 7.2v 2000mAh Ni-Mh.

Can I just swap them and use the same charger?

the Ni-Cad has a chip attached I assume to sort out the charging. Will this work on Ni-Mh cells?

I can post pictures if it will help.

Cheers
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fatjames
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Joined: 09 Jul 2011
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PostPosted: 12:14 - 17 Sep 2018    Post subject: Reply with quote

GUESS

I'd have thought it will depend on the chargers ability to know when they're fully charged. (and possibly the rate of charging?)

Here's a read about nickel metal hydride charging:

https://batteryuniversity.com/learn/article/charging_nickel_metal_hydride

Extract of interest:

Nickel- and lithium-based batteries require different charge algorithms. A NiMH charger can also charge NiCd; a NiCd charger would overcharge NiMH.
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bugeye_bob
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PostPosted: 12:14 - 17 Sep 2018    Post subject: Reply with quote

https://www.rcgroups.com/forums/showthread.php?356111-charging-NiMH-battery-with-NiCd-Charger
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 13:44 - 17 Sep 2018    Post subject: Reply with quote

Or, get a cheap hobby charger like the B6AC, which will do any battery you choose pretty much, including lead acid batteries and give you some nice stats for it too.

Not so much 'plug and play' however.
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jjdugen
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PostPosted: 15:49 - 17 Sep 2018    Post subject: Reply with quote

Cant understand the love for NiCad, its very fussy about charging, is highly toxic to the environment and V V expensive. Metal Hydride are more expensive than lead acid, but are nearly as efficient as NiCad with few of the downsides. They do need a dedicated charger but are less prone to self immolating than NiCad. Still not convinced that any of these exotics are better in an automotive environment with its heavy discharge and iffy charging regimes.
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Courier265
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PostPosted: 20:36 - 17 Sep 2018    Post subject: Reply with quote

NiCad?? that's so last century... Embarassed
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chris-red
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PostPosted: 21:12 - 17 Sep 2018    Post subject: Reply with quote

jjdugen wrote:
Cant understand the love for NiCad, its very fussy about charging, is highly toxic to the environment and V V expensive. Metal Hydride are more expensive than lead acid, but are nearly as efficient as NiCad with few of the downsides. They do need a dedicated charger but are less prone to self immolating than NiCad. Still not convinced that any of these exotics are better in an automotive environment with its heavy discharge and iffy charging regimes.


Who loves Ni-Cad?
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 21:12 - 17 Sep 2018    Post subject: Reply with quote

Courier265 wrote:
NiCad?? that's so last century... Embarassed


Hence why they need replacing...
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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MCN
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Joined: 22 Jul 2015
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PostPosted: 10:14 - 18 Sep 2018    Post subject: Reply with quote

Fcuk all to do with OP

But not completely off topic

I keep my auld batteries and boost them (whenever I remember) and use them to blow up the bike and car tyres.

I use a ctek charger and fitted the wee lead to the old batteries for convenience.

I also have an ice cream tub full of depleted AA, AAA 9V etc. cells.

I think the local recycle place can take them, I know they are mental things to end up in a landfill.

I wondered what the value of the lithium is.

https://batteryuniversity.com/learn/article/battery_recycling_as_a_business

Disappoint.. Sad

I saw a doco on the telly about Pb and stuff and the market for old lead acid batteries is excellent
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.
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