Build Rechargeable 3.7V Power for Your Small Electronics | | The NexEV 1S Micro Kit provides a TP4057 Type-C charge board and all hardware needed to add single-cell lithium power to any small project. The TP4057 handles charging safely — polarity-protected input, 4.2V charge cutoff, 100mA to 1A selectable charge current. | | Applications: Bluetooth earbuds · IoT sensor nodes · LED torches · Hobby robot actuators · Wearable electronics | | Kit Contains: TP4057 Type-C charge board (polarity protected) · 1× 18650 cell holder · 10cm pure nickel strip · 1× insulation ring · 15cm Kapton tape · JST PH2 connector pair | | Also Required (Not Included): 1× 18650 Li-Ion cell · 5V USB Type-C charger | | Note: The TP4057 is a charging IC — it does not include discharge protection. For applications requiring over-discharge protection, also purchase a DW01A single-cell protection board separately.