UnitPackPower 21700 High-Capacity Down-Tube Hailong E-Bike Battery Pack – 36V / 48V / 52V (14.4Ah to 32Ah Options) Powered by LG 5200mAh 3C High-Drain Cells for 250W to 2000W+ Motors

Upgrade your e-bike, mid-drive conversion, or custom build with the elite UnitPackPower (UPP) 21700 Hailong Down-Tube Lithium-Ion Battery Pack. Built using genuine LG 5200mAh 10A 3C high-drain 21700 cells—the same advanced cell technology utilized in modern electric vehicles—this battery delivers massive energy density, minimal voltage sag under heavy load, and sustained acceleration for high-power hub and mid-drive setups.

Designed to fit standard frame down-tube water bottle mounts, this pack is available in 36V (10S), 48V (13S), and 52V (14S) configurations with capacities ranging up to 32Ah. Engineered with a high-current Smart Battery Management System (BMS) and protected by an 18-month factory warranty, this pack provides dependable power for motor systems rated from 250W up to 2000W+.

⚠️ Voltage Configuration & Cell Technology Guide

IMPORTANT BATTERY CONFIGURATION & COMPATIBILITY NOTICE:

• Tesla-Grade 21700 LG Cells: Configured with high-capacity LG 5200mAh 10A 3C cells for higher energy density and improved thermal performance over traditional 18650 cells.

• Extended Cycle Life: Rated to maintain ≥80% capacity after 800 charge cycles.

• Motor Compatibility: Engineered for mid-drive systems (Bafang BBS02, BBSHD) and hub motors ranging from 250W up to 2000W+.

• 18-Month Factory Warranty: Backed by UnitPackPower's comprehensive 18-month warranty and safety support.

🚀 Key High-Performance Features

• Premium LG 5200mAh 21700 Cells: High-density cell architecture delivers longer ride range, higher continuous discharge rates, and superior longevity.

• Heavy-Duty Down-Tube Hailong Chassis: Mounts securely to frame water bottle bosses with a quick-release locking mechanism for easy indoor charging.

• Integrated Smart BMS Protection: Guards against over-charging, over-discharging, thermal overload, over-current spikes, and cell imbalances.

• CE & RoHS Safety Certified: Built to meet rigorous international quality control standards.

• Includes Smart Fast Charger: Shipped with a matching 2A/3A/4A automatic CC/CV lithium-ion charger.

📊 Technical Specifications Matrix

⚙️ Installation & Operation Guide

1. Mount the Bracket: Bolt the Hailong mounting rail onto your frame's down-tube bottle cage mounts using stainless hardware.

2. Connect Controller: Wire your motor controller's primary positive (+) and negative (-) power leads to the base plate connector.

3. Lock & Ride: Slide the 21700 pack into the rail until seated, turn the key to lock the battery in place, and power on your system.

📦 Package Contents

• 1 x UnitPackPower 21700 Hailong Lithium-Ion Battery Pack

• 1 x Down-Tube Mounting Base Plate with Discharge Cable

• 1 x Automatic Smart Lithium Fast Charger (2A/3A/4A)

• 2 x Security Lock Keys

• 1 x User Manual & Warranty Card

Power your ride with premium LG 21700 lithium technology. Select your voltage and capacity options below, click Add to Cart, and order today!

 

21700 Hailong Ebike Battery Specifications

 

Charger Plugs and Discharge Connectors Optional

1. Charger Plug: US, EU, UK, and AU plugs are optional; we will provide according to the delivery country if not requested.

2. Discharge Connector: There are 7 kinds optional as below picture; will be soldered with the default female connector&extra male connector if not requested.

3. If you have any requirements about this, please leave a message in your order.

Guarantee

1) We provide an 18-month warranty for all electric bike batteries.

2) If any battery has a quality problem within one month, we can resend you a new one after you provide your proof.

3) If any battery has a quality problem within one year, we provide free repair.

4) All our electric bicycle batteries have high-quality cells and BMS, and they will be 100% tested before shipping.

Top brand lithium battery manufacturer in China, rest assured to buy.

We don't provide warranty service for the following situations:

1) The battery goes over the water.

2) The battery is broken by man-made.

3) The cells are burnt out after incorrect use.

4) Return the battery without reason.

5) Open a dispute without contacting us.

FAQ

Q: What type of electric bike battery?

A: It is li ion battery; the chemical is Li(NiCoMn)O2.

Q: What is the difference between li ion battery, an Ni-MH battery, and a lead-acid battery?

A: E-bike Li-ion battery has longer cycle life; normal cycle life is 800-1000 times, and also with light weight, small size, no memory effect, non-toxic, environmentally friendly.

Q: What's the temperature range of charge and discharge?

A: Charge Temperature: 0 to 45°C and Discharge Temperature: -20 to 65°C

Q: What kind of cells are used in this electric bicycle battery?

A: Different capacities with different cells; we make the battery with original A-grade Samsung, Panasonic, Sanyo, LG, and high-quality domestic cells, all of which can be customized as per your requests.

Q: Do your e-bike batteries come with a charger?

A: All of our e-bike batteries come with a charger. We have a normal charger and a fast charger. If you need a fast charger, please get in touch with us.

Q: Do your electric bike batteries come with BMS?

A: Yes, our batteries all come with SEIKO IC BMS, with stable performance. This can protect the battery from short circuit, overcharging, overdischarging, and overcurrent.

Lithium Battery Features

1) Longer battery life; the life expectancy is two times that of lead-acid batteries.

2) Rechargeable and no memory effect.

3) The weight is lighter than other batteries.

4) Smaller dimensions and can be customized.

5) Safer and more environmentally friendly, no heavy metals and hazardous substances.

6) BMS built-in IC chip will prevent battery pack overcharge, overdischarge, over-current,over-heat, short circuit.

Warnings

Do not immerse the battery in water or seawater; keep the battery standing by in a cool, dry environment.

Do not use or leave the battery near a heat source, such as a fire or heater.

Use the battery charger specifically for that purpose when recharging.

Do not reverse the positive and negative terminals.

Do not connect the battery electrodes to an electrical outlet.

Do not discard the battery in fire or a heater.

Do not short-circuit the battery by directly connecting the positive and negative terminals with metal objects.

Do not transport or store the battery together with metal objects such as hairpins, necklaces, etc.

Do not strike, trample, or throw the battery.

Do not directly solder the battery or pierce the battery with a nail or other sharp objects.

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