We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Twenty small green circuit boards with micro USB ports and solder pads

KEHIPI

KEHIPI TP4057 1A Lithium Battery Charging Board Micro USB 20PCS

SKU CH-3F7V-XQ09J

Pack of 20 TP4057 boards charge single 3.7 V lithium cells at up to 1 A via Micro USB with over-voltage, over-discharge and over-current protection

  • ColorTP4057 Micro USB 20PCS
  • 20 boards ready for DIY 3.7V lithium projects
  • Micro USB input simplifies 5V power connections
  • 1A charging current with over-temperature protection
  • Built-in protection stops over-voltage at 4.2V and over-discharge at 2.4V
  • Auto pre-charge at 2.9V revives deeply discharged cells

DIY Lithium Battery Charging Modules

This pack contains twenty TP4057 charging boards, each designed for single 3.7 V lithium cells such as 18650 types. They accept a 4.2 V to 6.5 V input through a Micro USB connector and deliver up to 1 A programmable charge current with constant-current and constant-voltage phases.

Makers Adding USB Charging to Small Projects

The boards suit hobbyists building portable devices, tablet charge-port upgrades or other low-power DIY equipment that needs protected lithium charging. They are not for builders who require series-cell balancing, higher than 1 A charge rates, or a USB-C input interface.

Over-Discharge Protection Threshold at 2.4 V

Each module integrates a protection circuit that disconnects the load when the cell voltage reaches 2.4 V, preventing deep discharge damage. This single limit determines whether the board matches the safety requirements of your specific battery application.

Highlights

  • 20 boards ready for DIY 3.7V lithium projects
  • Micro USB input simplifies 5V power connections
  • 1A charging current with over-temperature protection
  • Built-in protection stops over-voltage at 4.2V and over-discharge at 2.4V
  • Auto pre-charge at 2.9V revives deeply discharged cells

Specifications

BrandAITRIP
ModelTP4057
ColorTP4057 Micro USB 20PCS

Questions about this item

What lithium batteries must I already have for these 20 TP4057 boards to charge them?

Each board charges single 3.7 V lithium cells such as 18650 types up to 4.2 V full voltage.

If I keep my 5 V 1 A USB wall adapter, will it power these boards within their input range?

Yes, the boards accept 4.2 V to 6.5 V input, so a standard 5 V USB supply works.

How do I confirm a board is charging correctly after I solder the battery and plug in USB?

The dual status outputs show charging, full, no-battery or fault states; current tapers to 100 mA at 4.2 V then stops.

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.