The most common and most likely answer to this crossword clue is the 12 letter word RECHARGEABLE
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Buddy explains!
The straight part
We know that "What criminal offences may not be/but some batteries are" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what criminal offences may not be/but some batteries are = rechargeable.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RECHARGEABLE mean?
RECHARGEABLE noun- A device that may be recharged
- Able to be recharged, especially of a battery that can be recharged from mains electricity via a charger