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How To Recharge Lithium Ion, Nickel Cadmium And Nickel Metal Hydride Batteries

Updated on November 2, 2014
What type are they?
What type are they? | Source

Rechargeable Batteries: Don't know your lithium-ion from your nickel-cadmium?

Li-Ion, Ni-Cd and Ni-MH?

"Aaaagggghhhh!", I hear you say, "What Do All Those Symbols Mean?"

Before you run away, give me a moment to explain:

There are lots of websites out there explaining all about batteries.

They tell you all kinds of things about them and go into great detail about scary-sounding technical subjects like "memory effects".

But you don't really want to know all that do you?

You don't need to know the why, you just need to know the how.

All you want to know is:

  1. Which batteries are rechargeable?
  2. How often do I need to charge them?

...and this article will tell you just that: no more, no less.

Oh sure, if you want the low down and really, really need to know the whys and wherefores then I'll give you some links to further reading at the end.

Otherwise, hold onto your hats and read on!

Oh, and look out for the giraffe (yes, there really is a giraffe in this article, see if you can find it)

Photo credit: all photos mine, unless stated otherwise.

Duracell - Rechargeable AA Batteries - long lasting, all-purpose Double A battery for household and business - 4 count
Duracell - Rechargeable AA Batteries - long lasting, all-purpose Double A battery for household and business - 4 count
Plain old AA size: just the right size right to keep those little rabbits going (remember them?)

3 Kinds Of Rechargeable Battery

Well ok, there are more kinds, but these are the main ones that real people (like you and me) actually use!

Here they are, in order from least, to most used:

  • Nickel-Cadmium (Ni-Cd)
  • Nickel-Metal Hydride (Ni-MH)
  • Lithium-Ion (Li or Li-ion)

Multi-type charger - does every kind of battery  you can think of
Multi-type charger - does every kind of battery you can think of | Source

How To Charge Them

There are different kinds of chargers you can get and they can look quite different to each other.

However, they all follow the same basic process:

  1. Use the right charger for the type of battery
  2. Put the batteries in the charger
  3. Wait until the light comes on/goes off, or whatever the instructions on the charger tell you

Note that you must put the batteries into the charger, you must insert them the right way round, just as you would when placing them into your favourite device.

Tip: most chargers have an automatic cut-off that stops charging the batteries when they are "full".

However, check the instructions for this feature before you leave it on all night.

Warning: Only recharge batteries that are specifically sold and labelled as "rechargeable".

Do not attempt to recharge standard alkali batteries as they can explode!

Photo right: my multi-purpose charger. Does both Ni-Cd and Ni-MH, in various sizes, all in one unit.

That's probably overkill for most people, but if you're trying to keep a green home, then it's well worth it.

Energizer Rechargeable AA Batteries, NiMH, 2300 mAh, Pre-Charged, 4 count (Recharge Power Plus)
Energizer Rechargeable AA Batteries, NiMH, 2300 mAh, Pre-Charged, 4 count (Recharge Power Plus)
More AA rechargeables, but may be cheaper ...or not, depending on the day. Seriously though, it's worth shopping around, because prices for the different brands do go up and down.

Nickel-Cadmium and Nickel-Metal Hydride

These are usually found in standard sizes such as AA and AAA.

They look just like standard 'Alkali' batteries, but are labelled with their type (Ni-CD or Ni-MH) and will always be clearly labelled 'rechargeable'.

Below are some of my Ni-MH batteries, as an example. Pretty, aren't they?

A few years ago, Nickel-Cadmium batteries were all the rage, but Nickel-Metal Hydride are better and so you are more likely to find them in the shops these days.

Regardless of which you have, they operate best and last longest if you drain them completely each time before you recharge them.

Tip: if you use these in a high power item like a camera, keep an extra pre-charged set with you.

That way, when the first lot loses power you just swap them over, so you don't have to lug the charger round with you.

Ni-MH Rechargeables
Ni-MH Rechargeables | Source

Don't Try This At Home - Poll

Giraffe Sticking Out Tongue
Giraffe Sticking Out Tongue | Source

9V Battery Poll

Go on, we've all done it haven't we?

...Or have we???

You're in school or college and the teacher puts one of those rectangular 9 volt battery in front of you.

Now you have a chance to see what it's like to create a short, by placing your tongue against both terminals....

Have you ever put your tongue on the battery contacts to see what would happen?

See results


These are currently the "best" kind of rechargeable battery you can get.

Li-ion batteries hold more charge - and for a longer time - than other kinds, and you can more or less do what you want with them.

They're much better for high power items too, like digital cameras with a built in flash.

They have become extremely popular as a result and come in all shapes and sizes as they are often custom built for a particular device.

You probably have one in your pocket right now, as most mobile phones have them inside.

Unfortunately, you can't get them in standard sizes (AA, AAA, etc), so you won't be able to put them in your old Ni-CD/Ni-MH charger either.

Apart from phones, examples of devices which can have Li-ion inside are iPods, tablets and laptops.

Not all cameras do, so check before buying - if it still uses Ni-MH batteries, then it could be the reason a particular model is really cheap.

Important: Lithium ion cells are not like Ni-CD or Ni-MH batteries!

You can charge Li-ion as often as you like and they last longest if you:

  • Use them a little bit and then charge them (even once a day is fine)
  • Don't let them drain completely (but see below)*
  • Don't overcharge them by leaving them plugged in for long periods once they are at 100%

The long and the short of it, is that if you are shopping for a new gadget or device that uses batteries, get the model which has a lithium-ion battery, if you can.

Tip: If you are not going to use a Li-ion battery for a long time (weeks or months) then it is recommended that you store them approximately 40% charged.

*Tip: most devices, like phones, have an indicator showing you the current charge state.

However, sometimes they can lose their calibration and give funny readings for the battery (one minute appearing to be 'charged' and the next, low or empty.

If this happens, simply use the battery until the phone says "empty" or "low" before you recharge it fully.

This full recharge will recalibrate the battery and should give the phone better readings again.


All batteries die eventually, but if you treat them right, they should give you years of good service.

For Those Who Really Want To Know

Here's some web sites that will tell you why rechargeable batteries are the way they are.

For the technically minded or the curious.

Leave A Comment

Enjoy this post, or find it helpful?

I think we have some very "interesting" results from our poll "would you put your tongue on a battery": what do you think?

Then let us know.

© 2013 Tim Bader


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    • Tim Bader profile imageAUTHOR

      Tim Bader 

      6 years ago from Surrey, UK

      I know what you mean about the feelings of guilt @Lorelei.

      Batteries are such little things and seem such a small part of our homes these days, but definitely worth using the reusable versions.

      We're fortunate enough that we can recycle both kinds in our neighbourhood, so that helps too.

    • Tim Bader profile imageAUTHOR

      Tim Bader 

      6 years ago from Surrey, UK

      Thanks Susan!

      You know what?

      Editing the article and seeing the giraffe made me laugh again, so I'm glad I kept it in.

    • SusanDeppner profile image

      Susan Deppner 

      6 years ago from Arkansas USA

      Back to visit after 17 months and still love the giraffe. And my clocks are still ticking. Love rechargeable batteries!

    • profile image

      Lorelei Cohen 

      6 years ago

      I was using chargable batteries for the past two to three years but the last pack didn't want to go so I switched back to the old standbys. I will have to get back to charging again then. I feel guilty every time I have to dispose/recycle batteries. Charging definitely helps to reduce that guilt.

    • Tim Bader profile imageAUTHOR

      Tim Bader 

      8 years ago from Surrey, UK

      @DebW07: Thanks!

    • profile image


      8 years ago

      This lens is full of good and useful information. Well done.

    • Tim Bader profile imageAUTHOR

      Tim Bader 

      8 years ago from Surrey, UK

      @the-gadgeteer: Thanks!

      Yes, I tend to prefer to know all the details too, but I've been trying to write shorter articles recently ;)

    • Tim Bader profile imageAUTHOR

      Tim Bader 

      8 years ago from Surrey, UK

      @lgOlson: You're welcome!

    • profile image


      8 years ago

      Good lens, just give the basics. I like a little more tech info myself, but for most folks, this is all they need/want to know.

    • lgOlson profile image

      L Olson 

      8 years ago from Northern Arizona

      Now, this is information I can use! Thanks Tim!

    • Tim Bader profile imageAUTHOR

      Tim Bader 

      8 years ago from Surrey, UK

      @artbyrodriguez: Thank you very much and thanks for reading.

    • artbyrodriguez profile image

      Beverly Rodriguez 

      8 years ago from Albany New York

      Bateries, batteries everywhere at our house. We do recharge and this is a great topic and well-done lens.

    • Tim Bader profile imageAUTHOR

      Tim Bader 

      8 years ago from Surrey, UK

      @SusanDeppner: Thanks Susan!

      Yeah, there's really not much reason for using plain old alkali batteries these days.

      Glad you liked the giraffe!

    • SusanDeppner profile image

      Susan Deppner 

      8 years ago from Arkansas USA

      Helpful! I've been using the Ni-MH batteries for my camera and my wireless mouse and a couple other things. They pay for themselves immediately, really - they're barely more than the throw-away batteries and the chargers are inexpensive. So much better than the old kind we used years ago - these hold the charge for a long time and they're charged when you get them, too. Thank you for answering a couple of questions I had about these. Brilliant use of the giraffe, by the way!


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