Re: Please discharge battery before entering the aircraft.
The reccomended storage level of lithium batteries is 40%, the individual cell voltage being about 3.8v. Some hobbyists who fly/drive RC vehicles only at the weekend will put their 40% charged batteries in sealable plastic bags then in the fridge until the next weekend. The plastic bag stops condensation from getting to the battery when you take it out and let it warm up before charging.
Biting the hand that feeds IT
