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What was the battery issue

• The investigating team found there was an issue with the design in battery A. The problem: Not enough room to allow for the expansion of
its electrodes, which happens during the normal charge and discharge cycle of the battery.

• Samsung own explanation is that “the negative electrode was deflected in the upper right corner of the battery,” which is an abnormality in

the design. In a normal battery, the positive and negative electrodes are properly separated, and the negative electrode is not deflected nor
is it touching the positive electrode.

• An additional contributing factor, according to Samsung was the tip of the negative electrode was incorrectly located, resulted in short-

circuiting of the battery.

• The second manufacturer's product (Battery B), suffered from abnormal ultrasonic welding burrs. (For more information on the flaws (see

the infographic) While the main cause was different in each type of battery, the result was the same. For ever thinner phones with longer
battery life has strained battery manufacturing processes.