Just use plastic bodied flashlights or use plastic C to D adaptors. Corrosion killed my 2D Maglite because the batteries lasted over a year. That is only a minor inconvenience with the old rubber and plastic Rayovacs and Garrets that I converted.
Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane