If the lenses are kept in your lowepro I would include Silica gel. - as there is no free air movement. I do not store my lenses or cameras in a bag but in a cabinet that is not air tight. In 35 years I have never had a problem. Any dampness present can escape.
If you are concerned or wish to check the storage environment a no cost trick would be to get a small slug of steel and clean it up with emery cloth then place it where you keep your kit. Check it from time to time. If rust appears you need to use silica gel.
In my workshop where I have heating set so it never falls below 10 deg C, I regularly open drawers and cupboards to allow a bit of air circulation and take pride in not having any rusty kit. This comes from an early experience when I did not do this and did suffer from the dreaded rust.
I cannot see how your batteries can come to any harm stored discharged, after all we buy them new in that state.
Don
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