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the rice thing is just to accelerate the drying up process. But can be done without,a week or 2 is actually good but for impatient people 48 hours seem forever,thus usage of rice is recommended.

well as far as charging batteries charging them on partial charges is actually better

http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

and also you might want...