WARNING: Please check the generation - not compatible with generation 1! Lifespan: approximately 1000 full charge cycles, without significant power loss The only necessary maintenance measure: clean and lubricate battery and connection terminals (terminal grease, technical petroleum jelly, silicone-free) Designed for mountain bikes, 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.