The Bosch wireless charging system consists of an inductive charger and specially equipped 2-amp-hour Li-ion batteries that fit the company’s 18-volt tools.

Inductive charging has been around for years and is used to charge small devices such as cellphones without removal of the battery. Wireless systems rely on a pair of coils—one in the charger works as a transmitter, while one in the battery is a receiver. Bosch’s new batteries get charged by plopping the tool on the charger. Do this every time...

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