The batteries for my 2720 are on the tongue. The first time I opened the battery boxes to redo the wiring I noticed a fair amount of water in the bottom. Since it was clean water and not battery acid I conclude that it was water that had gotten in while washing the TM.
I briefly considered drilling a small weep hole so that rain and wash water would drain out, but promptly concluded that it was a bad idea in the event of a failed battery that leaked acid. So after washing the TM I now check the battery boxes for water and just dump it out.
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