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Thread: li-ion 3.6 or 3.7 volts what is the difference

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    Flashaholic* TinderBox (UK)'s Avatar
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    Question li-ion 3.6 or 3.7 volts what is the difference

    Hi.

    My digital camera takes a 3.7volt battery , but i have seen lots on ebay with 3.6volts on them.

    WHY.

    Regards

    John.
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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Hello TinderBo.

    When Li-Ion first hit the market they have a mid point voltage of 3,6, they were charged to a maximum of 4.1 volt.

    Li-Ion cells after -95 has a nominal voltage of 3,7 Volt and they should be charged to 4,2 Volt.

    Nowadays 3.6 and 3.7 volt cells are the same.

    Anders

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    *Flashaholic* Marduke's Avatar
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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Petrol, gasoline, same thing. They are interchangeable.

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    Flashaholic* TinderBox (UK)'s Avatar
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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Hi.

    I read that charging a 3.7 lin-ion to 4.2 will reduce it`s life, and that 4.0 will prolong it`s life at a loss of some capacity.

    But if you charge a 3.6 in a 3.7 charger will not the 3.6 be more likely to be overcharged as you don`t know what the chargers max charge voltage is.

    So would it not be best to just stick to 3.7 volt battery`s , or is overcharge protection built into the battery`s

    Thanks

    John.


    Quote Originally Posted by Anders View Post
    Hello TinderBo.

    When Li-Ion first hit the market they have a mid point voltage of 3,6, they were charged to a maximum of 4.1 volt.

    Li-Ion cells after -95 has a nominal voltage of 3,7 Volt and they should be charged to 4,2 Volt.

    Nowadays 3.6 and 3.7 volt cells are the same.

    Anders
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    *Flashaholic* Marduke's Avatar
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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Quote Originally Posted by TinderBox (UK) View Post
    Hi.

    I read that charging a 3.7 lin-ion to 4.2 will reduce it`s life, and that 4.0 will prolong it`s life at a loss of some capacity.

    But if you charge a 3.6 in a 3.7 charger will not the 3.6 be more likely to be overcharged as you don`t know what the chargers max charge voltage is.

    So would it not be best to just stick to 3.7 volt battery`s , or is overcharge protection built into the battery`s

    Thanks

    John.
    They are virtually the identical battery. It's just a difference of what nominal voltage the manufacturer sticks on the label.
    Last edited by Marduke; 01-18-2009 at 09:24 PM.

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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Quote Originally Posted by TinderBox (UK) View Post
    Hi.

    I read that charging a 3.7 lin-ion to 4.2 will reduce it`s life, and that 4.0 will prolong it`s life at a loss of some capacity.

    But if you charge a 3.6 in a 3.7 charger will not the 3.6 be more likely to be overcharged as you don`t know what the chargers max charge voltage is.

    So would it not be best to just stick to 3.7 volt battery`s , or is overcharge protection built into the battery`s

    Thanks

    John.

    You.ll right about the first sentence, if you charge them to 4,1 or less than 4,2 Volt you'll prolong their life.

    The true 3,6 volts that would be charged to 4,1 Volt is no more in service life, they don't produce them no more.



    Anders

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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Hello Anders,

    In general you are correct, however, Saft is still making 3.6 V Li-Ion cells and is recommending charging them to 4.1 volts. I don't believe these are available to the general public as they are intended for space and military applications.

    Tom
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    Most batteries don't die - they are tortured to near death, then murdered...

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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Hello Tom.

    Aha, didn't know that, thanks Tom.

    I don't think they sell cells in "our" sizes like 16340 17640 16340 and so on.

    http://www.saftbatteries.com/Technol...1/Default.aspx

    Anders

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    Flashaholic* bluecrow76's Avatar
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    Ohgeez Re: li-ion 3.6 or 3.7 volts what is the difference

    EDITED: Good questions! I have a handful of Ultrafire 3.6V cells that I've always wondered if I could charge them in my Ultrafire WF-139 chargers.
    Last edited by bluecrow76; 01-18-2009 at 09:32 PM.
    EDC: Surefire e2l, Novatac P7/d2flex

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    Flashaholic* 45/70's Avatar
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    Default Re: li-ion 3.6 or 3.7 volts what is the difference

    Quote Originally Posted by Anders View Post
    I don't think they sell cells in "our" sizes.......
    She sells sea shells on the sea shore;
    The shells that she sells are sea shells I'm sure.
    So if she sells sea shells on the sea shore,
    I'm sure that the shells are sea shore shells
    .

    Don't know about Saft sizes, but I'm sure this babe could set us up will some sizable sea shells, for sure.

    I've always thought 3.6 and 3.7 Volt cells were the same, just rated differently. Interesting.

    bluecrow, are you sure that's not 3.0-3.7 Volt? I have a 138, and it's 3.0 Volt for LiFePO4 and 3.6 for LiCO.

    Dave
    Last edited by 45/70; 01-18-2009 at 09:23 PM.

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    Flashaholic* bluecrow76's Avatar
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    Ohgeez Re: li-ion 3.6 or 3.7 volts what is the difference

    Quote Originally Posted by 45/70 View Post
    bluecrow, are you sure that's not 3.0-3.7 Volt? I have a 138, and it's 3.0 Volt for LiFePO4 and 3.6 for LiCO.

    You're absolutely right. I was thinking of some blue Ultrafire 3.6V cells and wrote about my Powerex 3.0V cells instead! Updating my above post shortly. Thanks!
    EDC: Surefire e2l, Novatac P7/d2flex

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