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easy take out / battery

easy take out
easy take out

Usually,the top of the battery is smooth,almost flat, the finger is easy to slip when we are taking out the battery,so we have to try many times,and the finger is very pain.But now,there is a groove on the top of the battery,so we can take out it easily.

University

hunan university

hunan university
changsha, China

Zheng Wang,
Hunan University

Tongyong Wu,
Hunan University