This is not the first realization experiment. Even in May, the company introduced the GT concept phone with a battery for 10,000 mAh. An innovative silicone technology was used to provide high energy density (887 W · H/L). In this way, the phone remained quite thin – only 8.5 mm, about 200 g weighs.
It can be assumed that the 15,000 mAh version is built on the same principle and only has more capacity.
It is not yet clear whether it can reach mass production.
Source: Ferra

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