This part is a kind of semiconductor called TP4055.

Function of this product has 500mA Linear Li-Ion Battery Charger.

Manufacturers : NanJing Top Power

Image and pinout :

Some of the text within the PDF file :

南京拓微集成电路有限公司 TP4055 南京拓微集成电路有限公司 NanJing Top Power ASIC Corp. 数据手册 DATASHEET TP4055 (500mA 线性锂离子电池充电器) 概述、特点、典型应用-P2 管脚、特性指标--P3 引脚功能说明-P5 充电电流大小设置、电池反接保护功能P7 充电指示状态、无电池连接指示状态---P8 多种典型应用图、 [ ... ]

TP4055 PDF Datasheet Download