4piece professional and practical battery adapter convert case set designed for electronics and other devices converts any battery size to C size for use in devices that require C batteries just insert the battery into the convert, and it will function the same as a Csize battery battery limit slot fixes the battery in place for stable, reliable operation compact and portable design; small enough to carry easily in a bag or kit Key benefits and features broad compatibility: adapts any battery size to C size, enabling use in a wide range of devices reliable performance: secure fit prevents movement during operation, reducing risk of poor contact convenient portability: compact form factor makes it easy to transport and keep on hand simple operation: drop in your battery and the adapter takes care of the size conversion Specific use scenarios on the go: use in flashlights, remotes, toys, or radios when C batteries are not available field work or service kits: carry in a toolbox or emergency kit to ensure devices that need C batteries can be used home and travel: substitute C batteries in household devices without stocking multiple battery sizes Notes the product comprises 4 adapters designed to convert various battery sizes to C size designed to be easy to use with no special tools required