Can the battery be charged while riding using a dynamo or other external power source, and if so, what are the most efficient methods for doing so without overcharging or damaging the battery? Are there any widely available dynamo systems that are specifically designed to charge e-bike batteries, and how do they compare to traditional methods of charging via a wall outlet or external battery pack? What are the power output requirements for charging an e-bike battery on the go, and how do factors such as terrain, speed, and rider weight impact the ability to generate sufficient power to charge the battery while riding? Are there any potential drawbacks or risks to consider when using a dynamo to charge an e-bike battery, such as reduced efficiency or increased wear on the dynamo or other components? How do the benefits of charging on the go compare to the added weight, cost, and complexity of a dynamo system, and are there any situations in which charging via a dynamo would be preferable to traditional methods?