What criminal offences may not be, but some batteries are? (12)

I believe the answer is:

rechargeable

I believe this clue is a double definition.

'what criminal offences may not be' is the first definition.
(as in being charged with a crime)

'some batteries are?' is the second definition.
(rechargeable batteries)

'but' is the link.

I've seen this clue in The Times.

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