Quality Bicycle Products - The Bosch PowerPack 500 is the same size as the PowerPack 400 and only slightly heavier, but offers a longer range. When using the Bosch Standard Charger, this
36V 11.6ah Bosch Power Pack 300/400 Replacement Battery Custom Bosch Powertube 500 Replacement Battery Samsung Cell Powerful E Bike Battery - China Bosch Battery, E Bike Battery | Made-in-China.com