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A Fast Universal Battery Charger: Part 2

Second article has all the constuction details. This unit will solve all your charging problems once and for all.

By John Clark

Click for larger image

It's arguably the only "high capacity" fast battery charger you'll ever need – ever again! It will easily handle all the batteries you have in your power tools – it will even charge your car or motor bike battery!

And while it won't handle low capacity "AA" cells it can charge their big brothers – 1200mAh and above – along with "C" and "D" types of 1200mAh or more. For a more detailed list, see the panel at right or refer to the full description of operation in last month's SILICON CHIP.

Main Features

  • Fast charges Nicad, NiMH, LiION, SLA and Lead-Acid batteries
  • Suitable for 1.2V, 2.4V, 3.6V, 4.8V, 6V, 7.2V, 8.4V, 9.6V, 12V & 14.4V batteries from 1.2Ah to 4.2Ah plus LiION 3.6V, 7.2V & 14.4V
  • Charges either 6V or 12V SLA batteries from 1.2Ah to 4Ah
  • Charges 6V or 12V Lead-Acid batteries of any capacity above 1.2Ah
  • Includes a discharger for Nicad batteries
  • Top-off charging at end of fast charge plus pulsed trickle charge for Nicad & NiMH
  • Voltage limited charge for SLA & Lead-Acid batteries
  • Voltage drop & temperature rise (dT/dt) full charge detection for Nicad & NiMH
  • Under and over-temperature cutout for battery
  • Over temperature cutout for charger
  • Short circuit battery protection
  • Time-out protection
  • Fuse protection
  • Multi-LED charge indicators

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