Skip to content
← Back to projects
hardware · 2012

3× Lithium Polymer Charger

A finger-sized, low-cost charger that tops up three lithium-polymer batteries at once for about $2.50 per charger — built to support UCLA IEEE's OPS program instead of paying $10 per single charger.

  • PCB Design
  • Power Electronics
  • Battery Charging
The finger-sized 3× lithium polymer charger PCB

The 3× lithium polymer charger was designed as a low-cost way for students to charge their batteries, specifically to support the OPS program. It charges three batteries simultaneously and costs roughly $2.50 per charger (with a power supply), compared to paying $10 for a single charger at SparkFun.

Each battery charges at a maximum rate of 500 mA and has an individual status indicator that shows when the battery is fully charged.

Schematic

Charger schematic

Board

Charger PCB layout