aimjin Hailong DP-9 Downtube Lithium-Ion E-Bike Battery Pack (36V / 48V / 52V) – High-Capacity 18650 Cell Matrix with Integrated Smart BMS & USB Charging Port

Upgrade your electric bicycle's range and raw output with the aimjin Hailong DP-9 Downtube Lithium-Ion Battery Pack. Designed for maximum frame compatibility and clean aesthetic integration, the Hailong DP-9 casing mounts directly to standard water bottle boss mounts on your bike's downtube, offering exceptional weight distribution and easy key-locked removal.

Engineered with high-density 18650 lithium-ion cells and protected by an advanced 30A Continuous / 60A Peak Smart BMS, this battery delivers linear power flow across demanding hills and high-speed commutes. Featuring an integrated 5V USB output port, the Hailong DP-9 also doubles as a mobile power bank to charge your smartphone, GPS, or bike lights while on the move.

⚠️ Technical Verification Note

CAPACITY & MATRIX SPECIFICATION ADVISORY: Standard Hailong DP-9 casings accommodate specific cell arrays (such as 10S3P, 10S4P, or 10S5P). Depending on the specific voltage selected (36V, 48V, or 52V) and cell chemistry, physical pack capacities typically range between 12Ah and 20Ah using premium 18650 cells. Please review controller amperage limits to select the proper voltage variant for your drive system.

🚀 Key High-Performance Features

• Universal Downtube Hailong DP-9 Casing: Measures 360mm x 90mm x 110mm to fit cleanly inside most standard triangular frame geometry with bottle mount alignment.

• Multi-Voltage Options (36V / 48V / 52V): Select the exact voltage match for your motor controller system—36V for daily urban commuting, 48V for standard all-around performance, or 52V for maximum speed and reduced voltage sag.

• Integrated 30A Continuous BMS Protection: Built-in Smart Battery Management System continuously monitors cell balancing and protects against overcharge, over-discharge, overcurrent, thermal spikes, and short circuits.

• Convenient 5V USB Device Charging: Built-in USB output port allows you to power external accessories directly from your main drive battery while riding.

• Quick-Release Key Lock Mount: Includes a reinforced mounting bracket with a dual-key anti-theft locking mechanism for effortless extraction and charging indoors.

📊 Technical Specifications Matrix 

⚙️ Installation & Operation Guidelines

1. Mounting the Rail: Secure the Hailong base bracket to your downtube's bottle cage threads using the provided stainless steel hardware.

2. Locking the Pack: Align the DP-9 battery slots with the base rail, slide down into place until seated, and turn the key to lock the pack securely.

3. Charging Routine: Always connect the charger plug to the battery charging socket before plugging the charger into the AC wall outlet. Use a dedicated CC/CV lithium charger matching your pack's voltage (e.g., 54.6V charger for 48V pack).

📦 Package Contents

• 1 x aimjin Hailong DP-9 Downtube Lithium-Ion Battery Pack

• 1 x Lock-In Base Mounting Rail Interface

• 2 x Safety Keys

• 1 x Discharge Connector Cable

Upgrade your e-bike range today with reliable Hailong power. Select your voltage specification below, click Add to Cart, and enjoy fast, free shipping on your order!

36/48/52V  30Ah-50Ah Specification :

Battery: built-in Samsung INR 18650
Matrix mode: 
36/48/52V:30Ah=10S3P  40Ah=10S4P  50Ah=10S5P
Normal Voltage: 36/48/52V
Rated Capacity:30Ah-50Ah
Battery size:360*90*110mm
Max Constant Discharge Current:30A
Peak current:60A
Charge voltage:54.6V
Discharge cut-off voltage:25V-39V-40V
Way of Charge: CC/CV
Cycle Life:1000 times
Charge Temperature:-15-65℃
Discharge Temperature:-15-65℃
Protection Function: Overcharge, Overdischarge, Overcurrent, Short circuit, Balance48V Battery 52V 36V ebike Battery Hailong Downtube BMS 18650 Cell rechargeable Lithium Battery USB for Electric bicycle