LaskaKit TP4056 Li-ion cell charger

Product detailed description

The TP4056 chip module is a compact and simple solution for charging single-cell Li-ion batteries (3.7 V) via USB-C or direct connection via pins. The battery is easily connected using a JST-PH-2 connector (2 mm pitch), eliminating the need for soldering. The module is ideal for DIY projects, powering portable electronics, or power banks. Thanks to the integrated over-, under- and short-circuit protection, it is safe for normal use.

We also offer accessories for more convenient wiring:

• JST-PH-2 (2 mm) to 2x JST-PH-2 – battery splitter – allows you to connect the load and the battery simultaneously

Protection functions:

This module uses the original TP4056 Li-Ion IC charging regulator.

• Constant current and constant voltage control for charging the connected lithium battery.
• Overvoltage protection – the module will safely charge the battery up to 4.2 V.
• Trickle charging (battery reconditioning) – if the voltage level of the connected battery is lower than 2.9 V, the module will charge it with a current of 130 mA until the battery voltage reaches 2.9 V again, at which point the charging current increases from linear to the configured charging current.

The module includes two indicator LEDs. The red LED indicates charging, and the blue LED indicates a full charge.

The charging current can be configured externally with the resistor Rprog. The TP4056 manual (link in the files section below) includes a table and equation for the resistor value used to configure various charging currents. Additionally, there are jumpers on the board that allow you to set the current to 780 mA, 400 mA, 250 mA, or 130 mA. To change this, simply cut the top (connected) pads with a knife and solder the ones corresponding to the desired charging current.

The module consumes a very small amount of current (µA) when connected to the battery, making it suitable for long-term battery connection. However, if you wish to store the battery for more than 4 months, we recommend disconnecting the battery from the charger.

The module supports the connection of 2 parallel cells – i.e., you can connect two lithium rechargeable cells to create an equivalent single battery with a total capacity twice as large as the capacity of the individual cells. However, we do not recommend connecting more than two parallel cells at once to this module.

Specifications:

• Charging chip: TP4056 (original)
• Charging Method: CC/CV
• Input voltage: 4.5 – 8.0 V
• Input connector: USB-C, or direct connection via pins
• Battery connector: JST-PH-2, 2-pin, 2 mm pitch
• Charging current (adjustable via jumper):
  • 1 A (adjustable via Rprog.)
  • 780 mA
  • 400 mA
  • 250 mA
  • 130 mA
• Charging termination (voltage): 4.2 V ±1.5%
• Overvoltage protection:
  • Detection: 4.3 V ±50 mV
  • Release: 4.1 V ±50 mV
• Trickle charging (Battery Reconditioning):
  • Limit up to: 2.9 V ±0.1 V
  • Current: 130 mA ±10 mA
• Indication: 2× LED (red – charging, blue – charged)
• Quiescent current: units of µA (suitable for long-term battery connection)
• Dimensions:
  • Length: 29 mm
  • Width: 19 mm
• Weight: 3 g

Package contents:

• 1× LaskaKit TP4056 Li-ion cell charger

Important Notice and Safety:

• The module is intended exclusively for single-cell Li-ion / Li-Pol batteries (3.7 V nominal, 4.2 V charged). Do not use it for LiFePO4, NiMH, lead-acid or other types of rechargeable batteries.
• Always set the charging current according to the cell capacity. For small cells (e.g. 250 mAh), use the lowest setting of 130 mA – charging with a current higher than 1C damages the cell.
• Ensure the correct polarity of the battery connection. Reverse polarity can permanently damage both the module and the battery.
• Do not leave the charging battery unattended on a flammable surface and do not cover it.
• Do not charge mechanically damaged, swollen or leaking cells.
• The module warms up slightly during charging – ensure adequate ventilation and do not place it in an enclosed space without air circulation.
• You have to be careful when connecting two cells in parallel. Both cells must have the same voltage. If one cell has a lower voltage, it would discharge to the lowest possible discharge limit. Ensure that both cells have the same voltage whenever possible. In this case, the tension will be balanced. If the voltage of the two cells is very different, the cell may overheat or worse. When charging two parallel cells with this module, the charging current of each cell is half of the total charging current of the module, meaning that each cell maintains the same voltage level.
• If you wish to store the battery for longer than 4 months, disconnect it from the module.

Notes:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustrative purposes only and may sometimes differ from the actual appearance of the item. However, this does not change their basic characteristics.