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Extended Battery / Extended Battery

Extended Battery

The battery can be by the (AAA) battery models through the unique structure of the spring to an extension of (D) models of the length of the battery, flexible spring can be of different length adjustment

University

Guang Dong Industry Technical College

Guang Dong Industry Technical College
Guangzhou, China

Chun Yang

Design

Guang Dong Industry Technical College

Guang Dong Industry Technical College
Guangzhou, China

Jianchong Yao