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Power source

Ross

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7 9 4*

'power source' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for battery that I've seen before include "Storage cell" , "Means of storing electric current" , "violent offence" , "Group of cells (or guns)" , "criminal offence" .)

I've seen this clue in The Star Tribune, The Independent and the Sydney Morning Herald.
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