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Samsung's Galaxy phones haven't surpassed 5,000mAh batteries for over five years due to US and EU regulations on lithium-ion battery transport (49 CFR 173.185). These regulations limit battery capacity to around 20Wh. While Chinese competitors offer larger batteries, they often don't sell extensively in the US or Europe. Samsung's global reach necessitates adherence to these regulations, limiting battery size in its flagship devices. Companies like Apple, Google, and Motorola also adhere to similar capacity limits.

Prepared by Jonathan Pierce and reviewed by editorial team.