If you are using the SRAM eTap system you need to charge your eTap Lithium Polymer battery. SRAM's dedicated single battery charger will recharge your battery in just 45 minutes. Three indicator lights show charging level.

The battery engages with the charger in only one way, and safely clips in and out with minimal fuss. Simply connect the charger to any USB power source or A/C USB adaptor. This compact charger is easily to store or travel with.