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Aleaivy Hailong Downtube Lithium-Ion E-Bike Battery Pack (36V / 48V / 52V – Up to 20Ah) – Heavy-Duty Power Solution for Bafang BBS02, BBS03, BBSHD Mid-Drive & Hub Motors

Power your drive system with the Aleaivy Hailong Downtube Lithium-Ion E-Bike Battery Pack. Engineered specifically for high-torque mid-drive conversions (such as the Bafang BBS02, BBS03, and BBSHD series) as well as heavy-duty hub motor builds, this Hailong case provides exceptional weight distribution, IP65 weather resistance, and long-range reliability.

Built using high-density 18650 / 21700 lithium-ion cells and safeguarded by an integrated Smart Battery Management System (BMS), this battery delivers clean, surge-resistant power across steep inclines and high-speed commutes. Customize your build with your choice of 36V, 48V, or 52V nominal outputs and either 4-Pin or 5-Pin base rail interface connections.

⚠️ Base Rail Selection Advisory (4-Pin vs. 5-Pin)

PLEASE SELECT THE CORRECT BASE INTERFACE:

4-Pin Base: Features 4 discharge blade connectors on the mounting rail (standard for standard controller interfaces).

5-Pin Base: Features 5 discharge blade connectors on the mounting rail (recommended for high-amp setups and select controller protocols).

Please inspect your current motor power lead or mounting plate to ensure you select the matching 4-Pin or 5-Pin base rail option during checkout.

🚴 Broad Motor & Kit Compatibility

Bafang Mid-Drive Systems: Fully compatible with Bafang BBS01 (36V/48V 250W–500W), BBS02 (48V/52V 500W–750W), BBS03 / BBSHD (48V/52V 1000W+).
Direct Drive & Geared Hub Motors: Fits 250W, 500W, 750W, 1000W, and 1500W direct-drive and geared hub motor conversion kits.

🚀 Key High-Performance Features

Universal Hailong Frame Integration: Mounts directly to standard water bottle cage threaded bosses on your downtube for a low center of gravity and balanced handling.
IP65 Weatherproof Casing: Sealed high-impact housing shields internal battery cells and electronics from heavy rain, road splash, and trail dust.
Multiple Capacity Options (10Ah / 15Ah / 20Ah): Match your exact commute range requirements with energy outputs spanning 360Wh up to 1040Wh.
Integrated Smart BMS: Protects your investment against overcharging, over-discharging, overcurrent, thermal runaway, and short circuits.
Anti-Theft Key Lock & On-Pack LED Indicator: Features an integrated lock to secure the pack to your frame base rail, along with a push-button LED charge level gauge.

📊 Technical Specifications Matrix

Specification Parameter	Aleaivy Hailong Battery Specifications
Brand Designation	Aleaivy
Casing Style	Hailong 1 / Hailong Downtube Style
Base Rail Interface	4-PIN or 5-PIN Base Rail (Optional)
Nominal Voltage Options	36V / 48V / 52V
Capacity Options	10Ah / 15Ah / 20Ah
Total Energy Output	360Wh / 480Wh / 540Wh / 720Wh / 960Wh / 1040Wh
Cell Format	Premium 18650 / 21700 High-Density Lithium-Ion
Weatherproof Rating	IP65 Waterproof / Dustproof
Safety Certifications	CE, UL Certified
Item Weight Range	Approx. 3.75 kg – 5.8 kg (8.2 lbs – 12.8 lbs depending on capacity)
Warranty Protection	2-Year Manufacturer Warranty
Hazardous Chemical Registry	`High-concerned chemical: None`

Installation & Operation Guidelines

Mounting the Base Rail: Fasten the 4-Pin or 5-Pin base plate to your bike frame's water bottle cage bosses using stainless steel M5 bolts.
Connecting to Controller: Connect the discharge cable extending from the base plate directly to your Bafang motor harness or external motor controller using matching connectors.
Locking & Removal: Align the Hailong pack with the base rail track, slide downward until fully seated, and turn the key to the locked position to lock the pack in place.

📦 Package Contents

1 x Aleaivy Hailong Lithium-Ion Battery Pack (Choice of Voltage/Capacity)
1 x 4-Pin or 5-Pin Downtube Base Mounting Rail
2 x Anti-Theft Safety Keys
1 x Discharge Extension Cable

Power your Bafang mid-drive or hub motor build with reliable Hailong performance. Select your voltage, capacity, and pin setup below, click Add to Cart, and order today!

Please note: Our batteries are suitable for most electric bicycles, for example: Bafang, Voilamart, AW, Tongsheng, but except Bosch, SHIMANO, Yamaha, and Panasonic. If you cannot confirm the battery, please contact us.

*Come with the 2A Charger & 2 Keys & 2 Screws & User Manuel &Ebike Battery.
*Equipped with the Top 18650 Cells & USB Port, for a 3- 5 Year life span; the battery case has a waterproof function.
*Built-in BMS for Using Security & 1,200 times Recharge-Cycle.
*The electric bike battery pack has 4-PINS/5-PINS(optional) battery base with a discharge cable, and will fit most bike frames.

Please note before purchase:

1. What is the voltage of your bicycle? If it's 36V, buy a 36V battery. If it's 48V, buy a 48V battery. You can also tell the voltage of the battery
you need from your original battery or the control center. 10Ah,15Ah,20Ah, and 30Ah represent the battery capacity and indicate the range

2. Is the size of the battery suitable for fitting into your bicycle frame

3. The interface between the battery and the base needs to be determined. We have two types of interfaces: 4-pin and 5-pin. If your original
battery base is 4-pin and you don't want to replace the base, you can purchase a 4-pin battery set. If it's a 5-pin battery base, buy a 5-pin
battery because our battery set includes the base.

Of course, if you don't mind replacing the original battery base, you don't need to worry about whether the battery base is 4-pin or 5-pin,
because our batteries come with battery bases

4. When charging, please connect the power supply first and then the battery

5. Do not use up all the battery power completely. The battery should charge it each time with some remaining power

6. When you receive a new battery, make sure to charge it before using it.

About this item:

【Solid & Waterproof】This battery shell is made of water-resistant and firm ABS plastic casing, ensure protect the inside cells from damages for fallen or crashes. Meanwhile, it has IP65 waterproof coverage sealing to avoid water and moisture damage, so it can be used throughout the day, whether it is rain or mud.

【Advanced Battery Management System】This e-bike battery has a design with the smart battery management system, referred to as BMS. The BMS has to undertake a more accurate calculation of electricity to ensure the service life of the ebike battery, can also protect the bike battery from the damage of short-circuit, over-current, over-charge, and over-discharge, to provide safety while the electric bike battery is running.

【Safe Lock】Anti-theft function.LED power Indicator: Real-time battery level detection, reminds you to charge the battery. Power Switch: Reduces battery power loss.USB Port: Can charge your phone.30A BMS: Can effectively protect the battery and make it safer. Waterproof case: Reduces the possibility of damaging the internal battery.Anti-vibration Pads: It has already adhered to the battery base.Stronger and less vibration! Product with 4-pin battery base/5pin battery base, easy to install. Discharge wire with yellow wax tube, which is waterproof, anti-electricity, and high temperature resistant!

【 ≥80% Capacity After 800 Cycles】Our electric bicycle battery uses automotive-grade A cells; every e-bike battery has passed the QC appearance and function test before shipment. The ebike battery charge cycle exceeds 1000 times, ≥80% capacity after 800 cycles.

【Precautions】After installing the electric bike battery according to the instruction manual, please fully charge the lithium battery before use. Please turn on the switch when you recharge so that the battery can be recharged 100% fully.

Specification:

Please confirm the motor and voltage of your ebike before purchase and check whether the size of the battery can be placed in your bike's frame, and finally choose the battery that fits your bike.

Charging note: Please connect the charger to the power supply first, and then connect the charger to the battery

Package List (According to your choice)

* 1 x Lithium Ion (Li-Ion) Battery

* 1 x Female XT60 Connector

* 1 x Male XT60 Connector

* 1 x BMS

* 1 x Lithium Ion (Li-Ion) Battery Charger

* 3 x Screws(One spare)

* 2 x Keys

Nominal Voltage	36V 10Ah	36V 15Ah	36V 20Ah	48V 10Ah
Base In Plug	4-PINS	4-PINS	4-PINS	4-PINS
For motor	36V 0~1000w	36V 0~1500w	36V 0~1500w	48V 0~1500w
Watt Hours	360Wh(Power:30-40KM)	540Wh(Power:45-60KM)	720Wh(Power:50-80KM)	480Wh(Power:45-50KM)
Cell	A-grade 18650	A-grade 18650	A-grade 18650	A-grade 18650
Weight	3.75 kg(8.27lbs)	4.9 kg(10.8lbs)	5.5 kg(12.13lbs)	4.4 kg(9.7lbs)
With Charger	42V2A	42V2A	42V 2A	54.6V 2A
Discharge Connector	XT60	XT60	XT60	XT60
BMS	30A(BMS)	40A(BMS)	40A(BMS)	30A(BMS)
Size	3709589mm (14.573.743.5in)	37095122mm (14.573.744.8in)	37095138mm (14.573.745.43in)	3709589mm (14.573.743.5in)

Nominal Voltage	48V 15Ah	48V 20Ah	52V 20Ah	36V 10Ah
Base In Plug	4-PINS	4-PINS	4-PINS	5-PINS
For motor	48V 0~1800w	48V 0~1800w	48V 0~2000w	36V 0~1000w
Watt Hours	720Wh(Power:45-60KM)	960Wh(Power:60-80KM)	1040Wh(Power:60-90KM)	360Wh(Power:30-40KM)
Cell	A-grade 18650	A-grade 18650	A-grade 18650	A-grade 18650
Weight	5.8 kg(12.79lbs)	6.8 kg(14.99lbs)	6.3kg(13.89lbs)	3.75 kg(8.27lbs)
With Charger	54.6V 2A	54.6V 2A	58.8V 5A	42V2A
Discharge Connector	XT60	XT60	XT60	XT60
BMS	40A(BMS)	40A(BMS)	40A(BMS)	30A(BMS)
Size	37095122mm (14.573.744.8in)	370 x 95 x 138mm (14.57 x 3.74 x 5.43in)	370 x 95 x 138mm (14.57 x 3.74 x 5.43in)	3709589mm (14.573.743.5in)

Nominal Voltage	36V 15Ah	36V 20Ah	48V 10Ah	48V 15Ah
Base In Plug	5-PINS	5-PINS	5-PINS	5-PINS
For motor	36V 0~1500w	36V 0~1500w	48V 0~1500w	48V 0~1800w
Watt Hours	540Wh(Power:45-60KM)	720Wh(Power:50-80KM)	480Wh(Power:45-50KM)	720Wh(Power:45-60KM)
Cell	A-grade 18650	A-grade 18650	A-grade 18650	A-grade 18650
Weight	4.9 kg(10.8lbs)	5.5 kg(12.13lbs)	4.4 kg(9.7lbs)	5.8 kg(12.79lbs)
With Charger	42V2A	42V 2A	54.6V2A	54.6V 2A
Discharge Connector	XT60	XT60	XT60	XT60
BMS	40A(BMS)	40A(BMS)	30A(BMS)	40A(BMS)
Size	37095122mm (14.573.744.8in)	37095138mm (14.573.745.43in)	3709589mm (14.573.743.5inch)	37095122mm (14.573.744.8in)

Nominal Voltage	48V 20Ah	52V 20Ah
Base In Plug	5-PINS	5-PINS
For motor	48V 0~1800w	48V 0~2000w
Watt Hours	960Wh(Power:60-80KM)	1040Wh(Power:60-90KM)
Cell	A-grade 18650	A-grade 18650
Weight	6.8 kg(14.99lbs)	6.3kg(13.89lbs)
With Charger	54.6V 2A	58.8V 5A
Discharge Connector	XT60	XT60
BMS	40A(BMS)	40A(BMS)
Size	370 x 95 x 138mm (14.57 x 3.74 x 5.43in)	370 x 95 x 138mm (14.57 x 3.74 x 5.43in)

Aleaivy IP65 waterproof Hailong lithium battery pack with key lock and LED status gauge

The Charger is UL 62368-1 certified and can provide documentation showing certification on request.

The Battery is UL 2849 and UL 2272 certified and can provide documentation showing certification on request.

The creepage distance and electrical gap distance in the charger are sufficient; the product does not pose a fire risk and will not cause
components to overheat or explode, and the output has a fuse to protect the battery pack from overcurrent conditions.
Battery charging input and output cables are also adequately protected against stress.

The plug meets the size requirements of the relevant standards, and there is no risk of electric shock to the user. The fuse complies with
relevant standards and does not pose a risk of fire or explosion in the event of failure. The product has been marked and labeled in
accordance with the standards

Aleaivy IP65 waterproof Hailong lithium battery pack with key lock and LED status gauge

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.

We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.