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Magic changeable battery case adaptor
Description
A smaller size battery can be converted / upsized and used as a larger battery in case of an emergency situation. (ex. Clock ran out of battery and required a size D battery; however, you've got only an AAA at hand. Simply slide an AAA into the shell and it can now work as a size D.)
For household use, only a smallest AAA-size battery will be needed, it won't be necessary to buy batteries in variouse sizes; thus saving money and helping to protect for a better environment.
