Children's toy manufacturers secure electronic toy battery compartments with child-proof release clips or with one or more screws to prevent young children from accessing the toy's batteries. The toy's instruction manual comes with information on acceptable batteries and with safety tips for correct battery replacement.
Opening toy battery compartments involves using a finger to release the safety latch on the battery compartment, which children find hard to do. A variation of this safety lock is a little opening at the edge of the battery compartment where a parent inserts a flat-head screw driver to force the compartment to open. The safer locking mechanism is one secured with screws that require a screw driver to open; this method requires a real tool and advanced hand dexterity for extra safety.
The United States Consumer Product Safety Commission warns that batteries can cause chemical burns in children within two hours if swallowed. The commission's website provides parents with valuable battery safety literature.
Toy manufacturers such as Mattel have very specific requirements regarding battery type usage and frequently warn parents not to use certain types, such as rechargeable batteries. The companies designed the toys for use with specific battery types and the toys might malfunction if powered improperly.