Tell us about yourself!
This is a nice treatise on "machine" drying tomatoes. Actual "sun" drying is drying in the sun. I consider using a machine to be safer and less labor intensive.
One must be careful to make sure that the battery that you are trying to charge is a "lithium-ion" battery. Those lithium "non-rechargeable" batteries can explode violently if you try to charge them. I know!
Baby oil is mineral oil and fragrance. That is easy to find.