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Friday, 25 January 2013

9v Fast(ish) Battery Charger Stripboard Veroboard Layout

most of the chargers I own don't work fast enough - they take in the order of 14 hours so I thought "why not make one" since I have about 30 things with chargeable 9 volt batteries in them it would be nice to make a few of these. Anyway I wanted to make one that automatically cut off but it got a bit messy so I figured I would just drop the amount of current going into the battery so I could just leave it going for a few hours.

to work out charge time: hours = mAh / mA
example case: a 9v battery I have is rated at 150mAh
150 \ 50 = 3
therefore 3 hours

the LED illuminates when the battery is connected

the Transistor (BD135) needs to be heatsinked but the LM317 doesn't so if you're using a metal case you could just screw the transistor to the case and use that as the heatsink


  1. Beautiful - just what I need. Thanks!


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  2. will it work with non rechargeable batterys ?

  3. most of the chargers I own don't work fast enough -batteroo inc

    1. fuck off advertising your shitty useless snakeoil products here.

  4. Hi,
    This is a nice post. The post is full of major information. Most important thing is the diagram is very good. Thank you for your brilliant post. Hope you post your next article soon.