As long as it is vacuum sealed from moisture, with all the air evacuated, and not just a ZipLoc bag out of which you "pressed all the air." Otherwise, the air i

As long as it is vacuum sealed from moisture, with all the air evacuated, and not just a ZipLoc bag out of which you "pressed all the air." Otherwise, the air inside the bag is the same air as where it was sealed, maybe the 50%RH of the air in a climate controlled home and kitchen, and temperature changes will cause the vapor in the air to precipitate out into moisture, and back to vapor, and this repeats every time the temperature fluctuates, which usually is twice a day as part of a freezer's frost cycle. But then you are still using far more energy, and money, to save a minuscule amount lost from self-discharge. Li-ion cells have low self-discharge and only lose about 15% capacity per year. LSD NiMH cells like Eneloop lose about 30% capacity after 5 years. Alkaline cells, surprisingly, lose only 2-3% per year in self-discharge. LiFeS2 cells, like Energizer Ultimate Lithium, have an extremely low self-discharge rate, well under 1% per year, and have more than a 10 year shelf life, though they'll probably hold charge for at least 20 years of dry storage. I wonder what it would amount to in mAh to lower the temperature of cells to below freezing and maintain that temperature for a year. You'd probably lose in a contest with someone panning gold out of a bottle of Goldschläger.