Heat in dim battery brand (8)

I believe the answer is:

duracell

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'battery brand' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'heat in dim' is the wordplay.
'heat' becomes 'race' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'dim' becomes 'dull' (synonyms).
'race' going within 'dull' is 'DURACELL'.

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I've seen this clue in the Sydney Morning Herald.

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