Life expectancy: approximately 1000 complete charging cycles, without significant loss of performance Only necessary maintenance measure: clean and lubricate battery and connection poles (pole grease, technical Vaseline, silicone-free) Designed for MTB, flat and compact profile, impact-resistant and vibration-resistant as well as waterproof Note: Battery versions with an A at the end of the Shimano article number are no longer compatible with the old charger EC-E6000.