Not sure about the 18V, but the batteries from my 14.4V Grizzly work
in my 14.4V Harbor Freight. The latch doesn't engage, but the fit in
all the way and the drill works, so I'm OK with it.
Just do a little checking around at a store somewhere and see what you
can find. On the other hand, the genuine Panasonic battery packs are
pretty good and worth the price.
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