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Solar powered mobile phone battery charger

Discussion in 'Power Electronics' started by infiniti25, Nov 25, 2012.

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  1. infiniti25

    infiniti25

    3
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    Aug 21, 2012
    Hi,

    I am Matt and I live in the UK. We have a store here called Lidl and a few months ago I was bought a Rocktrail Dynamo Solar-Powered LED Torch which supplies power to a ZNB branded 3.6V 110mAh Lithium-Ion(LIR2450) coin battery (a bit thicker than a motherboard coin battery) by either the solar panel or the pullcord at the bottom (Dynamo).

    I recently saw a project to Reuse Old Mobile Phone Battery for LED lighting which got me thinking about my solar torch.

    Well I have a Nokia BL-6F 1200mAh 3.7V battery and was wondering if I have to modify the solar panel circuit board to allow charging the 3.7V battery and what parts I may need. I do have an account on RS-Online and I live close to a Maplin store so I can get components from either/both.

    I haven't used the battery for a long time, but it still reads 3.76V on the multimeter. I was also wondering what the limitations/problems would be from charging via solar panel/dynamo (I know how charging from a PC's USB port vs Mains power decreases how long my mobile phone lasts). Would the same thing happen here?

    If you are able to advise me I would be very grateful.

    Rocktrail circuitboard pictures

    [​IMG]

    [​IMG]

    EDIT

    I have read the following quote at this link

    Does this mean I should be able to use the solar charging circuit as is, I will only have problems with undercharging? If so then I guess I am going to need something along the lines of a joule thief to boost the output. I haven't done any electronics since school over 10 years ago, so I will probably open a few new thread with other questions I have so I can get started along a winter of electronics projects.

    END EDIT
    Thanks and regards,

    MATT
     

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    Last edited: Nov 25, 2012
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