Connect with us

Solar powered mobile phone battery charger

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

Scroll to continue with content
  1. infiniti25


    Aug 21, 2012

    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




    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.

    Thanks and regards,


    Attached Files:

    Last edited: Nov 25, 2012
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day