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Green rectangular circuit board with two USB ports and battery terminals

Ruth's sister

Ruth's sister 270B4NB905907 international power cord

SKU CH-V9RC-9PFW9

A DIY power-bank circuit board that boosts a 3.7 V lithium cell to dual USB outputs of 5 V at up to 2.4 A total

  • Converts 3.7V lithium cells to stable 5V USB output
  • Single port delivers up to 2.1A for phone charging
  • Dual ports supply up to 2.4A combined for multiple devices
  • Accepts standard 5V charger input for simple recharging
  • Minimum 100mA load required to maintain regulation

DIY power-bank boost module

This PCB board converts a 3.7 V lithium cell into a 5 V USB supply rated up to 2.1 A on a single port or 2.4 A combined across two ports. It is intended for hobbyists building their own portable chargers for phones or tablets.

Input and output limits

The module only accepts a 5 V charger for recharging the cell and will not work with PD or other fast-charge protocols. A minimum load of 100 mA is required, so very low-current devices such as Bluetooth headsets or MP3 players cannot be powered.

Battery and wiring checks

You must use a 3.7 V lithium battery rated at 3C or higher; aged or salvaged cells from laptops, drills or EVs should be tested with a multimeter before connection. Reverse polarity, series wiring and mixed cell types are strictly prohibited.

How it compares

Measured against everything we stock in Worldwide Power Cords, at today’s prices. Recalculated every night.

Price $10.99
Pricier than about 70% of the 1,208 comparable items (median $9.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Which output should I use if I need up to 2.1 A for one device?

Use the single USB port, which delivers 5 V at 0.1–2.1 A maximum.

What input voltage does the board expect from a charger?

The board accepts a 5 V input; PD chargers are not supported.

What is the minimum load current the board can recognise?

The minimum recognition current is 100 mA, so very low-draw devices such as Bluetooth peripherals will not be powered.

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