Wireless electronic shifting systems from Shimano as well as tire pressure monitoring sensors require compact, reliable power sources that deliver consistent voltage over extended periods. The CR1632 Battery from Energizer uses lithium manganese dioxide chemistry to provide 3 volts and 130 milliamp-hours of capacity in a coin cell measuring 16mm diameter by 3.2mm thick. This battery powers Shimano's 12-speed Di2 wireless shifters found in Dura-Ace, Ultegra, 105, and GRX groupsets, lasting approximately 2 years in Dura-Ace and Ultegra levers or 3-4 years in 105 and GRX shifters that use two batteries per lever. The same battery runs SRAM's TyreWiz tire pressure sensors for 300 hours of monitoring, plus certain heart rate monitors and cycling computers that use this size.

The battery maintains stable voltage output throughout its discharge cycle, which prevents the performance degradation you experience with batteries that lose voltage as they deplete. Lithium chemistry handles temperature extremes from -22°F to 140°F, working reliably during winter training rides or summer centuries where handlebar-mounted components experience direct sun exposure. The 10-year shelf life means you can stock replacement batteries without concern about degradation during storage. Each battery weighs 1.8 grams and replaces equivalent designations including BR1632, DL1632, ECR1632, KCR1632, and KECR1632 across different manufacturers.