Milwaukee 4932451245 M18 B9 REDLITHIUM-ION™ Slide Battery Pack
18V...

Battery - A device used for the storage of electricity

rubber - Synthetic rubber is any artificial elastomer, usually a polymer, and is used as a substitute for natural rubber.

rubber - Natural rubber is an elastomer derived from the latex containing sap of some plants.

Waterproof - Resistant to water, usualy specified by depth in metres

Ideal - Something that satisfies a perfect criteria.

Li-ion - A rechargable battery. Popular in portable electronics combining one of the best energy densities and not suffering memory effect. Very slow loss of charge when not in use.

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