Charging a battery

Discussion in 'Tech/Mech General' started by beachcaster, Feb 16, 2012.

  1. beachcaster

    beachcaster Read Only Funster

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    This is not a motorhome battery.....but a small battery pack that powers
    a very powerful cree bike light.

    I bought the light a while ago and fear I have thrown the charger away
    ( I know how daft !).

    I have a Maplins plug-in charger that allows me to dial in the voltage to charge small appliances....with all the right size plugs etc

    But what voltage do I set it to ............the battery pack has a connector
    and is described as 8.4 volt .....6400mAh........

    so how many volts do I put in when charging.

    Yes I know nothing about this topic:Smile:

    barry
     
  2. rainbow chasers

    rainbow chasers Read Only Funster

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    4.2v judging by the chargers they supply for their cree bike lights.
     
  3. scotjimland

    scotjimland Funster Life Member

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    The charging voltage must be higher than the battery voltage to push a current through it ... so I would suggest setting the charger to 9v .. then keep an eye on it, watch how warm the battery gets..
    It will get warm, but shouldn't get hot.. If it gets hot, reduce the charging voltage.

    Also, most important.. ensure you have the correct polarity .. ie .. + to + ... and NOT + to -

    That's my view on it.. lets see what the other leccy gurus say
     
  4. beachcaster

    beachcaster Read Only Funster

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    The light is a The Magicshine MJ-808..and wasnt purchased from Maplins.

    barry
     
  5. beachcaster

    beachcaster Read Only Funster

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    Jusr seen I can buy a dedicated separate charger from the dreaded bay for £7.99

    So thats what I've done....should have looked there first really :)

    thanks

    barry:Smile:
     
  6. pappajohn

    pappajohn Funster Life Member

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    and you'll need it too.....

    according to the spec it is a 7.4V 4.5Ah lithium-ion battery and will need a special charger


    www.magicshinebikelights.co.uk
     
  7. beachcaster

    beachcaster Read Only Funster

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    Thanks for the comments..........as for the light it is quite stunning
    I love my cree torches..........but this light is astonishing I bought it direct from china..though they are easily available in the uk now .Loads of videos about them on you tube....but its somewhere between 900 and 1400 lumens depending who you beleive
    and its super bright.

    barry:Smile:
     
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