What would be the most effective method for installing a battery system on an e-bike with a unique frame design, taking into account the need for optimal weight distribution, aerodynamics, and accessibility for maintenance and upgrades? Would a custom-designed battery mount be the most efficient solution, or are there existing products that could be adapted to accommodate the bikes distinctive geometry? How would you balance the competing demands of minimizing weight and maximizing energy storage capacity, while also ensuring the battery system is secure, reliable, and easy to service? Would a distributed battery system, with smaller batteries placed throughout the frame, offer advantages in terms of weight distribution and aerodynamics, or would this approach introduce unnecessary complexity and compromise overall performance? What role might advanced materials, such as carbon fiber or titanium, play in the design of a custom battery mount or enclosure, and how might these materials impact the overall weight and durability of the system? Could a modular battery system, with interchangeable battery packs, offer a practical solution for riders who need to balance different demands, such as commuting and recreational riding, and how might this approach affect the overall design and functionality of the e-bike?