🔋 48V 20Ah Downtube E-Bike Battery – Grade A 50GB 21700 Cells • 40A Smart BMS

1000Wh Capacity • Hard Case • 3A UK Charger Included

Power your e-bike with the MCR Electric 48V 20Ah Downtube Battery, built using Grade A 50GB 21700 (5000mAh) lithium-ion cells for outstanding reliability, performance and range. Delivering approximately 1000Wh of energy and protected by a 40A Smart BMS, this battery is ideal for e-bike conversions using motors from 250W to 1500W.

Designed to fit medium-sized bicycle frames with lower bottle cage mounting points, this durable hard-case battery provides a secure, professional installation while maintaining a compact design.

⚡ Features

• ✔️ 48V 20Ah Downtube Battery
• ✔️ Approx. 1000Wh capacity
• ✔️ Grade A 50GB 21700 (5000mAh) lithium-ion cells
• ✔️ 40A Smart Battery Management System
• ✔️ Suitable for 250W–1500W motor systems
• ✔️ Compact hard-case construction
• ✔️ Designed for medium-sized bicycle frames
• ✔️ XT90 discharge connector
• ✔️ XT90 to XT60 adaptor included
• ✔️ 54.6V 3A UK charger included

📏 Specifications

• Nominal Voltage: 48V
• Battery Capacity: 20Ah
• Energy: Approx. 1000Wh
• Cell Configuration: 13S4P (52 Cells)
• Cell Type: Grade A 50GB 21700 (5000mAh)
• Battery Management System: 40A Smart BMS
• Maximum Continuous Discharge: 40A
• Peak Discharge Current: 60A
• Battery Dimensions: 365 × 90 × 125mm
• Approximate Weight: 8kg

🔌 Charger & Connections

• ✔️ 54.6V 3A UK Battery Charger Included
• ✔️ XT90 Male/Female Discharge Connector
• ✔️ XT90 to XT60 Adaptor Included

🚲 Compatibility

Suitable for many e-bike conversion kits and custom builds using:

• ✔️ 48V Systems
• ✔️ Motors from 250W to 1500W
• ✔️ Medium-sized bicycle frames with lower bottle cage mounting points

If you're unsure whether this battery is compatible with your bike, contact MCR Electric and we'll be happy to help.

📦 Package Includes

• ✔️ 1 × 48V 20Ah Downtube Battery
• ✔️ 1 × 54.6V 3A UK Battery Charger
• ✔️ XT90 to XT60 Adaptor

💳 Payment Options

• ✔️ Klarna – Pay in 3 interest-free instalments (subject to approval)
• ✔️ PayPal Accepted

✅ Certification & Compliance

• ✔️ UKCA Certified
• ✔️ CE Approved
• ✔️ MSDS Certified

⚠️ Lithium Battery Safety

• ⚠️ Never leave the battery charging unattended.
• ⚠️ Only use the supplied or approved charger.
• ⚠️ Do not puncture, crush or expose the battery to fire.
• ⚠️ Do not use if the battery is damaged, swollen or water affected.
• ⚠️ Store in a cool, dry location away from heat sources.
• ⚠️ Keep out of reach of children.
• ⚠️ Installation should be carried out by a competent person.
• ⚠️ Always follow the supplied instructions before use.

🛡️ Warranty & Returns

Warranty

✔️ 12-Month Warranty

The warranty does not cover:

• ❌ Modified or tampered batteries
• ❌ Misuse, abuse or accidental damage
• ❌ Water damage
• ❌ Use with unauthorised parts or accessories

Returns

• ↩️ Returns accepted within 14 days
• ✔️ Item must be unused and returned complete with all supplied accessories
• ❗ Return postage costs are the responsibility of the buyer

⚖️ Legal Notice

Please ensure your e-bike complies with all applicable local laws and regulations before use.

It is the rider's responsibility to ensure the battery and e-bike are used legally and safely.

🤝 Why Choose MCR Electric?

• 🇬🇧 UK-based expert support
• 🚚 Fast UK dispatch
• 🔧 Batteries tested before dispatch
• ⚡ Premium Grade A lithium-ion cells
• 🛠️ Trusted by custom e-bike builders across the UK
• 🛒 Wide range of batteries, motors, controllers and accessories available