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Battery Technology's family of products grew to include over 1000 products for notebook computers, cellular phones, camcorders, and the Zip Drive. BTI has become one of the leading manufacturers of batteries and accessories for notebook computers. It offers products for many manufacturers' notebook computers and cellular phones. By maintaining strict quality standards in production, as well as in sourcing, BTI is able to provide high-quality products. Battery Technology offers this battery for ThinkPad T20, T21, T22, T23.