Hacked Gadgets Forum

June 10, 2010

Automatic Battery Charger Project

at 5:42 pm. Filed under Electronic Hacks


There are some battery chargers that you can buy which have some built in smarts but the standard ones are basically a large transformer and some large rectifier diodes.  The main issue with the basic charger design is that if they are left connected to the battery for a long duration they will overcharge the battery. Instead of paying the big bucks have a look at the design that Razor made, he has also provided the full schematic so that you can easily build your own.

“Device consists of two main parts; power supply with current and voltage regulation (2 x LM317) and voltage monitoring circuit with switching relay. The charging procedure starts when voltage drops below 12.6V, and finishes when it gets to 13.8V. These values are not fixed and can be adjusted with trim-pots. The maximum charge current can also be adjusted with DIP switches.”


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8 Responses to “Automatic Battery Charger Project”

  1. Trc202 Says:

    Awesome, keep them coming.

  2. Intelligent battery charging - Hack a Day Says:

    […] [via HackedGadgets] […]

  3. Jay Says:

    I like this. No more baking a battery to death.

  4. Electronics-Lab.com Blog » Blog Archive » Automatic battery charger Says:

    […] This charger is an automatic one that will prevent battery from overcharging. The circuit consists of two main parts a voltage and current regulator and a voltage monitoring circuit with a cutoff relay. When the battery voltage is below 12.6V the it’s charging and when voltage goes to 13.8 then charging process is stopped. [via] […]

  5. Circuits – How to Build an Automatic Battery Charger! Says:

    […] via hackedgadgets […]

  6. bamshak Says:

    am very happy I got this crcuit.carry on!

  7. siyabonga Says:

    the introduction of thev automatic battery charger

  8. J.K.R. ADDO Says:

    Please I need the circuit diagram for the auto battery charger.

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