6V Lead Acid Battery Charger using BQ24450

  • Rajkumar Sharma
  • 9539
  • easy
  • Tested

6V Lead acid (SLA) battery charger project is based on BQ24450 IC from Texas instruments. This charger takes all the guesswork out of charging and maintaining your battery, no matter what season it is. Whether you have a Bike, Robot,  RC Car,  Truck, Boat,  RV, Emergency Light, or any other vehicle with a 6v battery, simply hook this charger maintainer up to the battery. The BQ24450 contains all the necessary circuitry to optimally control the charging of lead-acid batteries. The IC controls the charging current as well as the charging voltage to safely and efficiently charge the battery, maximizing battery capacity and life. The IC is configured as a simple constant-voltage float charge controller. The built-in precision voltage reference is especially temperature-compensated to track the characteristics of lead-acid cells, and maintains optimum charging voltage over an extended temperature range without using any external components. The low current consumption of the IC allows for accurate temperature monitoring by minimizing self-heating effects.  In addition to the voltage- and current-regulating amplifiers, the IC features comparators that monitor the charging voltage and current. These comparators feed into an internal state machine that sequences the charge cycle.


  • Supply 10V DC
  • Screw Terminals For DC Supply Input & Battery
  • Supply Current 1Amp
  • Charging Current 500mA
  • Regulate Voltage & Current during charging
  • Precision Temperature-Compensated Reference


Parts List




  • Hello,

    I’m very interested in your circuit. Is it possible to use a solar pannel as input; if yes, what would be the optimal configuration. Then, can this device be used as an UPS (uninterruptible power supply) to plug a MCU just after the battery ?



    9 months ago
  • Brad Auld

    Looking at around 70 of these to eliminate batteries in apartment locks and have an external 6v sealed LA left on continuous charge, can it handled a 12v input or be trimmed to handle a 12v input (already have these)
    Cheers Brad

    5 months ago

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