The dollar store sells Panasonic carbon batteries.
They don't seem to ever leak, and a 4 pack of AAs is $1.
Change them every Jan 1st.
A guy in OH unboxed a NIB Black Knight and it still had carbon batteries in it, dead, but un-leaked.
Even new alkaline batteries can leak when the diode fails and they don't like being charged.
The regular carbon batteries don't seem to mind being charged by the board.
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