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Tiny green PCB with USB plug, JST socket, two LEDs and a solder jumper

Adafruit

Adafruit Micro Lipo USB LiIon/LiPoly Charger 100mA 500mA

SKU CH-GNAY-03HDJ

Compact USB charger for single 3.7V or 4.2V Li-Ion/LiPoly cells with selectable 100mA or 500mA charge current and included JST cable

  • TypeEngineering Development Tools
  • Ready to use straight from the box, fully assembled and tested
  • Charges 3.7 V and 4.2 V Li-ion or Li-poly cells safely
  • Selectable 100 mA or 500 mA charge current via solder jumper
  • Powered directly from any USB port with 5 V input
  • Includes a free 2-pin JST cable for quick battery connection

Tiny USB LiIon/LiPoly charger for single-cell

This compact board charges a single 3.7V or 4.2V lithium-ion or lithium-polymer cell from any USB port. It arrives fully assembled and tested with a 2-pin JST cable included. The default charge rate is 100mA, safe for any compatible cell size and USB source. A solder jumper on the back raises the current to 500mA for larger packs.

Fits directly into a USB port

The PCB-style USB connector plugs into a standard port without extra cables or enclosures. The supplied JST cable mates with common battery packs, leaving the rest of the project free for other circuitry. No external power supply or host controller is required beyond the 5V USB rail. Builders needing multi-cell charging or higher currents will need a different solution.

Three-stage charge cycle with LED status under load

Charging begins with a preconditioning phase, moves to constant current at the selected rate, then holds a constant-voltage trickle to maintain full capacity. A red LED indicates active charging while a green LED signals completion. The 100mA default keeps thermals modest during sustained operation, and the 500mA option remains within typical USB current limits for continuous use.

Helstu kostir

  • Ready to use straight from the box, fully assembled and tested
  • Charges 3.7 V and 4.2 V Li-ion or Li-poly cells safely
  • Selectable 100 mA or 500 mA charge current via solder jumper
  • Powered directly from any USB port with 5 V input
  • Includes a free 2-pin JST cable for quick battery connection

Tæknilýsing

TypeEngineering Development Tools

Spurningar um þessa vöru

Does the 100mA default charge current limit how fast larger batteries can be charged?

The default 100mA rate charges any size battery safely from any USB port; for faster charging of cells 500mAh or larger you can solder the jumper on the back to enable 500mA mode.

How much heat or noise does the board produce when left charging all day?

The charger has no fan or moving parts, so it runs silently and generates only modest warmth during the three-stage charge cycle.

What battery connector do I need to already have on my LiIon or LiPoly pack?

The board mates with a standard 2-pin JST-PH connector; a matching JST cable is included in the package.

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