TP4056 Battery Charging Protection Module (V8)

Prototyping and Engineering Tips from Robogears

• The "OUT" vs "B" Pads: Always connect your battery to the B+ and B- pads. Your project (the load) should be connected to the OUT+ and OUT- pads. This ensures the protection circuit can cut power to your project if the battery runs too low.

• Heat Management: Since this is a linear charger, it dissipates excess voltage as heat. When charging at $1A$ from a $5V$ source, the chip can reach $60^{\circ}C$ to $70^{\circ}C$. If the board is inside a small enclosure, we recommend adding a tiny copper heatsink on top of the TP4056 IC.

• Programing the Current: If you are charging a small battery (less than 1000mAh), you should lower the charging current. The current is set by the $R_{prog}$ resistor (usually $1.2k\Omega$ for $1A$). Replacing it with a $2.4k\Omega$ resistor will reduce the current to $500mA$, providing a safer charge for smaller cells.

• Ammeter Connection: If you want to measure the charging current, connect your ammeter in series only with the $5V$ input, not between the module and the battery, to avoid interfering with the voltage sensing accuracy.

Package Includes

• 1 x TP4056 Battery Charging & Protection Module

Disclaimer

Never reverse the polarity of the battery connection (B+/B-); doing so will instantly destroy the TP4056 IC. Ensure the input voltage does not exceed $5.5V$. Lithium batteries are energy-dense and should be handled with care; always use this module in a well-ventilated area.