Lithium battery is the latest rechargable battery with minimum 500 time of charging cycle Long lasting then old Lead acid battery 48V 8AH lithium battery is only 2kg compare to old Lead acid 20kg fully charge can travel for distances approximately 30km (depand of conditions) MTB2620 26" Electric Mountain Bike Rims size: 26" Frame: Aluminium Motor: 350Watt brushless motor Battery: Removable 48V 8AH lithium battery Charger: 48V3AH DC2.5, auto swith off (charging time 4-6hours) Weight: 21kg with battery Brakes system: Front & rear disc brake Speeds : 7 speeds