This part is a kind of semiconductor called DW01.

Function of this product has One Cell Lithium-ion/Polymer Battery Protection IC.

Manufacturers : Fortune

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Some of the text within the PDF file :

DW01 Plus One Cell Lithium-ion/Polymer Battery Protection IC General Description The DW01 Plus battery protection IC is designed to protect lithium-ion/polymer battery from damage or degrading the lifetime due to overcharge, overdischarge, and/or overcurrent for one-cell lithium-ion/polymer battery powered systems, such as cellular phones. The ultra-small package and less required external components make it ideal to integrate the DW01 Plus into the limited space of battery pack. The accurate ±50mV overcharging detection voltage ensures safe and full utilization charging. The very low standby current drains little current from the cell while in storage. Ordering Information DW01+ PACKAGE TYPE SOT-23-6 TEMPERATURE RANGE -40°C~+85°C OVERCHARGE PROTECTION 4.3V± 50mV [ ... ]

DW01 PDF Datasheet Download