11. In United States waters, environmental regulations now require proper disposal of primary batteries removed from navigation aids. 12. As of 2007, AAA batteries accounted for 24 % of alkaline primary battery sales in the United States. 13. A "'lantern battery "'is a rectangular battery, typically an zinc-carbon primary battery , used primarily in flashlights or lanterns. 14. As of 2007, C batteries accounted for 4 % of alkaline primary battery sales in the United States. 15. Lithium primary batteries are also useful at lower temperatures than zinc batteries, all of which have water-based electrolytes. 16. Some types of primary batteries used, for example, for telegraph circuits, were restored to operation by replacing the electrodes. 17. Space vehicles have successfully used solar photovoltaic systems for years of operation, eliminating the weight of fuel or primary batteries . 18. Lithium primary batteries have a lower internal resistance than zinc primary batteries and so are more efficient in high-drain flashlights. 19. Lithium primary batteries have a lower internal resistance than zinc primary batteries and so are more efficient in high-drain flashlights. 20. Disposable alkaline batteries are classed as primary batteries ; manufacturers do not support recharging, and warn that it may be dangerous.
