Battery charging NiMH

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hank
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Quote:
Thank you ,, for the list

But was expecting atleast 3-5!!!

You have high expectations.

Try looking locally— put this into a Google search: Bangalore+India+“NiMH+charger”
Set the search tools to “verbatim” and a recent time span to improve the results.

You will find something close enough to what you want by looking close to where you live.

If India is not making a decent enough NiMH charger, there’s a business opportunity there.

But — seriously — instead of fast-charging your cells over and over, just buy four more cells and give them proper charging.
You will always have charged batteries handy that way.

maniac
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Reasonable expectations

“verbatim”

Search tools >> All results changed to “verbatim”

Time frame >> any time

Changing time frame to “past year” changes “verbatim” to all results

I suppose u can either choose “verbatim” or time frame ,, not both

Verbatim => tool to have Google search only for the specific terms you entered.

Learning something new , thanks ,,, have been a internet user for past 15+ yrs ,,

I did’not know the verbatim option !!!

But the search did’not give any worthwhile options!!!

sumesh

arow55
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Ronin42 wrote:
There is a guy on your tue who makes a good point:

To never buy a NIMH charger from a battery MFG. They have a vested intrest in you over charging and needing to buy more cells before you would have to if you got a proper charger. (their business is batteries and dont forget that).

As far as I can tell this jives with what HKJ reported also, (my paraphrase) “cheap chargers kill cells”


Guess I got lucky 5 years ago bought a Duracell charger with batteries model CEF21. Didn’t know anything about chargers but it does charge individually. Do I need to upgrade?
maniac
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LiitoKala Lii-200 ( 2 slot ) bought this one ,,I don’t think HKj will review it,,

Simple with only voltage display & battery charging indication,

single button for current selection = 0.5A/1.0A/1.5A !

sumesh

T-boon
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thank you HKJ for this.

befor i read this thread, i didnt know better, and i made this setup to charge my AAA eneloop pro,
the charging component is a simple Adjustable CC/CV step-down module
i know its usually used as a lion charger / LED driver, but i assumed it could be use as a nimh battery charger aswell,
the 18650 is only to power the voltmeter,

i got the voltage set to 1.5V, and the current to 100mA.
this setup have only Voltage termination and in theory the current will drop to 10mA when the voltage reach to 1.5 and eventually will terminate the charge.
now i know its working, because when its done i can use it in my AAA lights,
but what i dont know, is how far am i to actualy make the most out of this battery (how much real capacity im geting)

please help me to get better understanding about this setup, thanks.

T-boon
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gauss163 wrote:
You may find of interest the following note from Texas Instruments. It discusses CC/CV charging of 3S NiMh packs, but the discussion also applies to your case.

Charging a three-cell nickel-based battery pack with a Li-Ion charger, by Charles Mauney, Senior Applications Engineer, Power Marketing

i did find it intresting, was good reading, thanks Glasses

Venom
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Thanks for a great article!

When a NiMH battery comes off the charger what is considered normal voltage range, example 1.35V to 1.55V?

Does heat and humidity play a roll on how a battery charges?

HKJ
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Venom wrote:
When a NiMH battery comes off the charger what is considered normal voltage range, example 1.35V to 1.55V?

If you check the charge curves in my charger review you will get a good idea.
Eneloop are usual around 1.50V, the Leise cell is lower and both drops a bit fairly fast.

Venom wrote:
Does heat and humidity play a roll on how a battery charges?

Heat do, but I have not made any test on it.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Venom
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HKJ wrote:
Venom wrote:
When a NiMH battery comes off the charger what is considered normal voltage range, example 1.35V to 1.55V?

If you check the charge curves in my charger review you will get a good idea.
Eneloop are usual around 1.50V, the Leise cell is lower and both drops a bit fairly fast.

Venom wrote:
Does heat and humidity play a roll on how a battery charges?

Heat do, but I have not made any test on it.

Thank for the reply!

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