Best way to charge Li-on batteries?

LEDninja · Jul 1, 2007

NiCd/NiMH seem to like full discharge.
Lead acid/Recharable alkalines (Renewal,Pure Energy) like to stay topped up at all times?
What about Li-ons? Constantly topping them up or letting them do a full discharge?

DM51 · Jul 1, 2007

You should never let Li-Ions fully discharge. Aim to keep them between 3.5v - 4.2v.

ltiu · Jul 1, 2007

Slightly off topic.

Li-on batteries are used frequently in cell phones. I always hear people say that you should use up your cell phone batteries till it is almost out, before you re-charge it.

Is this true?

OR

Is this "still" true?

DM51 · Jul 1, 2007

Modern cell phone batts are mostly Li-Po, which should be treated the same as Li-Ion. So in other words, no, what you have been told is not true, but the phone will have a pretty foolproof protection circuit to prevent over-discharge anyway.

Tritium · Jul 3, 2007

ltiu said:
Slightly off topic.

Li-on batteries are used frequently in cell phones. I always hear people say that you should use up your cell phone batteries till it is almost out, before you re-charge it.

Is this true?

OR

Is this "still" true?

It was only true when Cell Phones used NiMh. No longer true with Lithium Ion.

Thurmond

OhMyGosh · Jul 3, 2007

I have heard that lithium-ion likes to be stored at around 1/2 charge (40%). As far as running them down I don't think it makes a big difference - just don't let the voltage get to low.

DM51 · Jul 3, 2007

OhMyGosh said:
I have heard that lithium-ion likes to be stored at around 1/2 charge (40%).

You can store Li-Ions at up to 4.1v (~90%) without damaging them.

OhMyGosh said:
As far as running them down I don't think it makes a big difference - just don't let the voltage get to low.

Aim not to go below a voltage of 3.5v at rest.

Best way to charge Li-on batteries?

LEDninja

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DM51

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ltiu

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DM51

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Tritium

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OhMyGosh

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DM51

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