ATTENTION: Please check the generation - not compatible with Generation 1! Sleek design, internal version Lifespan: approximately 1000 full charging cycles, without significant loss in performance The only necessary maintenance measure: clean and lubricate battery and connection poles (pole grease, technical petroleum jelly, silicone-free) Note: Battery versions with an A at the end of the Shimano article number are no longer compatible with the old charger EC-E6000, but with EC-E6002 or EC-E8004.