36V 13Ah Downtube eBike Battery – Varstrom

The Varstrom 36V 13Ah Downtube Battery is a compact, frame-mounted power solution designed for reliability, balanced weight distribution, and everyday e-bike performance. Built in a downtube (Hailong-style) case, this battery integrates cleanly with most standard e-bike frames, making it ideal for commuter builds, leisure riders, and conversion projects.

With a 36V 13Ah capacity, this pack delivers consistent power output and solid range for moderate-power hub or mid-drive motor systems. It’s engineered for stable discharge, efficient energy use, and dependable long-term operation.

Mounted centrally on the frame, the downtube design improves bike handling and balance compared to rear-rack batteries, while also keeping the setup sleek and low-profile.

Key Features

✅ 36V 13Ah lithium battery – balanced performance and range
✅ Downtube frame-mount design for improved weight distribution
✅ Clean, integrated appearance for conversion or OEM-style builds
✅ Reliable discharge performance for smooth power delivery
✅ Suitable for 36V motor systems (hub or mid-drive)
✅ Removable locking case for security and convenient charging
✅ Durable outer casing for daily riding conditions

Performance & Use

This battery setup is ideal for:

• Commuter e-bikes

• Leisure / hybrid builds

• Light off-road riding

• Standard-power conversion kits

It provides efficient support for typical 250W–500W systems, offering a strong balance between range, weight, and size without the bulk of higher-voltage packs.

Design Benefits

Because the battery mounts along the downtube:

• Weight stays low and central

• Handling remains stable and predictable

• Frame stress is reduced compared to rack-mounted systems

• The bike keeps a clean, professional finish

Compatibility

Designed for use with:

• 36V controllers

• Standard downtube mounting rails

• Most 36V hub and mid-drive conversion kits

Always confirm voltage compatibility before connecting to your system.

Important Notice

This battery is intended for use with 36V e-bike systems only. Ensure your motor controller, display, and charger match the battery specifications. Incorrect pairing may cause system damage.