May I know which one is grammatical?
the battery power is limited on mobile devices
the battery powers are limited on mobile devices
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Power is uncountable, so it's the first one.
the battery power is limited on mobile devices
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3Rather, "power" is uncountable when it means "energy". Consider: "her superhero powers included unaided flight and mind-reading" :)– KreiriSep 24 '14 at 9:42
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I actually thought about that. Decided that batteries should not have superpowers. Most inanimate objects just don't have the required responsibilities. Sep 24 '14 at 13:27
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The battery is dead. Before it died, was it animate? The powers that be are undecided.– user6951Sep 24 '14 at 19:28