357 / SR 44 Silver Oxide Battery for PowerTap Pro (2008 model), Powertap SL, PowerTap SL 2.4, Powertap SL2.4+, Powertap Elite+, Pro+, SL+ and SLC+ hubs. These are fitted in pairs. Wireless hubs use batterys much more quickly, in heavy use you may need to change batteries every 6 weeks.
You need a battery tool to change the batteries.
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