DIY Micro USB TP4056 4.2V CC/CV Li-Ion Charger

DIY Micro USB TP4056 4.2V CC/CV Li-Ion Charger
Product Code: TP4056-DIY1
Availability: 10
Price: $0.95

3 or more $0.90


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This is a small and inexpensive solution to charge most 4.2V Lithium-Ion cells.  It uses a true CC/CV algorithm and can work with pretty much any Micro USB power source.  The default peak charge current is approximately 1A, but it can be adjusted lower by changing out the current sense resistor (see table below for approximate values).  

The default resistor value is 1.2K Ohms, which provides approximately 1A peak charge.  For a nominal fee, we will reflow a different resistor onto the board, which you can choose by selecting your required resistor from the dropdown menu.

You can read HKJ's excellent review of this charger here.

You will need to solder some leads on to make this work with your desired setup.
There is no polarity protection on the battery side!  If you hook it up to the battery backwards, it will fry the IC.

Specifications:

  • Input Voltage: 4.5V-5.5V (Micro USB)
  • Charge Precision: 1.5%
  • Full Charge Voltage: 4.2V 
  • Dimensions: 25mmx19mmx10mm
  • No Reverse Polarity Protection
  • Red and Green Status LEDs

Resistance vs. Output Table

OHMS OUTPUT CURRENT
15,000 40 mA
10,000 130 mA
5,000 250 mA
1,200 1000 mA (default)

Here is some charging data from HKJ's review:

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