SRAM RED eTap Battery is the power source for the eTap system. The same power unit is interchangeable between front and rear derailleurs. Up to 1000 kilometers of riding per charge Selling because I have 2 and thought I’d need the spare, turns out I don’t do enough kms to warrant the second battery. Practically new! Grab a bargain because let’s be honest, £50 for a new one is a rip off.
