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Gray to red / Battery

Gray to red
Gray to red

You may often come across this problem :it is difficult to distinguish which one had been used among several battery that look like the same ,and which one is new.if there are two printing ink layer dots at the side of the battery which can prompt you the electricity consumption,then when one battery prosses larger consumption,you can gash one gray dot of them with your finger,and the eye-catching red layer could be exposed,when the electricity is used up and cannot work,the two dots would be gashed ,and then,it is time for you to abandon this battery.

University

China Academy of Art

China Academy of Art
Hangzhou, China

Design

China Academy of Art

China Academy of Art
Hangzhou, China

Zihan Zhang Zhaoxiang Huang Weihua Chen Xiaoya Yu