Answer: There is no battery leakage problem. The battery does not contain liquid electrolyte inside and uses a colloidal solid to make a thin battery. With a capacity of 3.6V400mAh, its thickness can be as thin as 0.5mm. The battery can be designed into various shapes and can bend and deform. Polymer batteries can bend up to about 900 and can be made into a single high voltage. Liquid electrolyte batteries can only be connected in series with several batteries to obtain high voltage. Polymer batteries, due to their lack of liquid, can be made into multiple layers within a single cell to achieve high voltage.