Varstrom Hailong Max High-Capacity Downtube E-Bike Battery Series – Premium 48V / 52V Lithium Power Upgrades with 40A BMS & Brand-Name 21700 Cells (Samsung, LG, EVE)

Unlock maximum torque and extended range on your daily routes. The Varstrom Hailong Max Downtube Battery Series is a collection of high-capacity, heavy-duty replacement and upgrade power packs engineered for high-performance electric bicycles. Designed to slide seamlessly onto your bike's standard water bottle cage mount rails, these premium downtube blocks are optimized for high-power demands, featuring continuous 40A Battery Management Systems (BMS) on select models to feed power directly into aggressive mid-drive configurations and heavy-hub cargo setups without overheating.

Built using premium, grade-A cylindrical 21700 and 18650 cell strings from industry giants Samsung, LG, and EVE, this modular power core maximizes energy density to deliver an exceptional 1000+ charge cycles before hitting early capacity drop-offs.

🚀 Key High-Performance Features

• Universal Motor Controller Compatibility: Engineered to perfectly drive premium mid-drive conversion kits and hub lines, including Bafang BBS01B, BBS02B, BBSHD, TongSheng TSDZ2B, TSDZ8, TSDZ16, and professional SUTTO/Varstrom powertrains.

• Tier-1 Brand-Name Cell Options: Ditch generic unbranded batteries. Our high-capacity packs are built using authentic LG INR21700M50LT, Samsung 21700, and EVE INR21700-50E cells for superior power delivery and low internal resistance.

• Integrated Heavy-Duty 40A Protection BMS: Select high-capacity configurations utilize a robust 40-Amp smart circuit matrix managing continuous output, keeping cells running cool even under long throttle pulls.

• Rapid Local Logistics & Service Infrastructure: Get back on the trail quickly with an expedited 1 to 7-day domestic delivery dispatch loop backed by physical regional maintenance support points throughout the US, UK, and EU.

• Intelligent 8-Tier Active Protection Matrix: Operates continuous protective sweeps monitoring cell-voltage balancing, short-circuits, over-current, over-voltage, temperature protection, and over-charging lines.

📊 System Architecture & Cell Configuration Selector Matrix

Identify your required nominal system voltage (48V or 52V) and targeted range footprint to choose the ideal premium cell string layout for your frame configuration:

⚙️ Environmental & Charging Constraints

• Constant Charging Architecture Method: Constant Current / Constant Voltage (CC/CV) loop interface.

• Active Charging Temperature Thresholds: 0°C to 45°C

• Active Discharging All-Weather Operation Windows: -15°C to 65°C (Built to withstand heavy sub-zero winter commutes and hot summer trail rides).

• Compliance Integrity Certification: Fully certified under global CE safety compliance standards with zero hazardous chemical footprints (High-concerned chemical: None).

📦 What's Inside the Box?

• 1 x Varstrom Premium High-Capacity Downtube Lithium E-Bike Battery

• 1 x Integrated Structural Mount Base Plate with Frame Screws

• 1 x Multi-Stage Smart CC/CV Battery Charger (2A, 3A, or 4A Model Matching Selection)

• 2 x Unique Frame-Lock Theft-Prevention Keys

• 1 x Factory Discharge Lead Cable Assembly (Configured to your controller plug style)

Ditch the range anxiety and upgrade your e-bike conversion kit with brand-name Samsung or LG cells. Select your target system voltage and amp-hour capacity below, click Add to Cart, and get your premium battery shipped fast from our domestic warehouses!

Varstromx Hai-long

E-Bike Battery

Power Your Journey with Confidence & Smart Design

Tired of range anxiety and complicated setups? Meet your e-bike's perfect partner. The Varstrom x Hai-long Downtube/Rack Battery isn't just a power source; it's the heart of a smarter, longer, and more secure riding experience, built with the quality you expect from a trusted name.

📦 Sleek Design, Universal Fit & Substantial Power

We've engineered this battery with a compact form factor to integrate seamlessly with most bicycle frames, whether you prefer the sleek, low-profile downtube mounting or the versatile rear rack setup. Its unassuming size belies the substantial energy within. Built with high-grade, genuine 18650 or 21700 lithium-ion cells, it delivers a robust capacity of up to 1440 Watt-hours. This translates to extended range for your adventures, allowing you to explore farther, commute without frequent recharges, and truly enjoy the freedom of electric assist.

🔌 Wide Compatibility & Ready to Connect

Designed for versatility, this battery is the universal key to unlocking your e-bike's potential. It works flawlessly with popular conversion kits from BAFANG and TONGSHENG, whether you have a mid-drive or hub motor system. Available in 36V, 48V, and 52V configurations, it suits a wide array of DIY e-bike projects and ready-made electric bicycles. It comes standard with a secure XT60 female connector for reliable performance. Need a different connector? Our team is just an email away to provide a tailored solution.

🛡️ Built-in Safety & Intelligent Protection

Your safety is our priority. The battery installs securely in its designated mount (a locking key is provided for theft deterrence), but the real peace of mind comes from within. We've integrated a comprehensive multi-protection circuit management system. It diligently guards against over-current, over-voltage, over-discharge, short circuits, and temperature extremes. This multi-layered protection actively ensures safe operation, preserves the battery's long-term health, and protects your valuable e-bike system.

💡 Multi-Feature Convenience for the Modern Rider

This battery is designed for real-world use. Charging is simple and secure via the reliable XLR charging port. The removable design offers ultimate flexibility: charge it conveniently anywhere, or even carry a spare for ultra-long journeys. A clear charge level indicator LED lets you check the remaining power at a glance, while the physical power switch adds an extra layer of safety and control, preventing accidental discharge during storage or transport.

⚡ Why This Battery is Your Best Choice:

· Trusted Power: High-capacity, genuine cells for reliable, long-lasting performance.

· Universal Partner: Broad compatibility with major motor systems and voltages.

· Safety First: Advanced electronic protection for worry-free riding.

· User-Centric Design: Removable, lockable, and easy to monitor.

Ready to upgrade your ride with dependable, high-performance power? The Varstrom x Hai-long Battery is the intelligent foundation for your next e-bike adventure. 🚴♀️✨

NEW HAILONG 48V30AH BATTERYNEW HY 48V20AH BATTERYNEW YINGWU 48V/52V25AH BATTERYBatteryPackingList📝:

1 pc Battery (Optional)

1 pc Battery Charger

1 pc Battery Manual

1 pc XT60 Port Motor Battery Connector Cable

1 set of Screws

2 pcs Battery Keys

Global Warehouse & Service Commitment

Our Commitment to You

🔹 Delivered Duty Paid(DDP)Assurance

For customers in the following countries, all taxes and import duties are prepaid by us, ensuring a hassle-free delivery experience:

France, Spain, Netherlands, Italy, Bulgaria, Belgium, Latvia, Poland, Denmark, Finland, Portugal, Sweden, Slovakia, Slovenia, Greece, Hungary, Czech Republic, Lithuania, Luxembourg, Romania, Ireland, Estonia, Croatia.

🔹 Rapid, Reliable Delivery

Your order will be dispatched from our nearest EU or UK warehouse for lightning-fast transit. Most deliveries arrive within 2–7business days (excluding remote regions).

Note: For logistical reasons, we currently cannot deliver to island addresses. If your location is on an island, kindly provide an alternative mainland address during checkout.

🔹 ComprehensiveWarranty& Support

 Motor & Battery:12months quality warranty for motor and battery

 Accessories & Parts:30-daywarranty for quality assurance.

Local Expertise: Our network of certified service centers across the EU and UK ensures prompt repairs and support.