Bosch batteries have no memory effect and can therefore be charged partially at any time. An occasional complete discharge is not necessary. The only necessary maintenance measure: clean and lubricate the battery and connection poles (pole grease, technical Vaseline, silicone-free). 25% more range with only 4% additional weight compared to the PowerPack 400. High mileage and long lifespan due to the integrated battery management system. Fully charged in 4.5 hours, half charged in 2 hours (4 amp charger).