Battery assortment packs bundle several common household battery sizes in one box, so drawers have the right cell for remotes, toys, flashlights, smoke alarms and clocks. The first decision is the mix, because a pack heavy with the sizes you rarely use is poor value however low the price per cell.
Chemistry is the next question. Alkaline batteries are the standard choice for most devices, while lithium cells last longer and perform better in cold weather and high drain devices such as cameras, at a higher price. Rechargeable cells suit devices you use every day but are usually sold separately.
Shelf life and storage matter for emergency kits. Check the expiry date printed on the cells, store them at room temperature in their packaging, and avoid mixing old and new cells in the same device.
Before buying, check the sizes and quantities in the pack, the chemistry, the expiry dates, and whether a storage case is included. Keep spare cells away from metal objects such as keys and coins, recycle used batteries where possible, and keep coin cells away from children. Smoke alarms, carbon monoxide detectors and medical devices should use the battery type the maker specifies, and many alarms now use sealed long life batteries that are not meant to be replaced by the user. Check high drain gadgets such as cameras and game controllers, which often do better on lithium or rechargeable cells than on standard alkaline cells.
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