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52v 15ah 21700 Cell Hailong Shark Battery (Bluetooth BMS - 40a Discharge)

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    The 21700 Hailong Shark Pack is a just a little bigger than the standard version, with a larger capacity - utilizing 21700 cells, which are just a little bigger than your usual 18650 cells, but pack quite a bit more punch! Typically installed on your downtube to the water bottle cage mount, this battery locks to, and quick releases from a reinforced mounting bracket. Some people make a backpack battery with these, others fit them inside a bike frame bag, place them on a rear rack, or in a pannier.

- This battery features a xiaoxiang Bluetooth Smart BMS with corresponding iPhone and Androids apps for monitoring, and configuring. This is a true 'Smart' BMS with a variety of safety features exceeding the specs of a standard BMS. Furthermore, unlike standard BMS which require charging to 100% in order to balance the cells, you can set your pack to automatically balance the cells while at any voltage level above 50%. This allows you to keep your battery perfectly balanced without having to charge to 100%, greatly extending your battery's cycle life.

- This battery is approx 775 watt hours. On average riders use around 20-25 watt hours per mile. You can expect around 35 miles range from this pack, (although with lower power/assist you may get upwards of 65-70 miles or so).

- This pack is suitable to power any 52 volt system that requires 40 amps or less of continuous discharge. This includes all stock 52v TDSZ2, 48/52v BBS models and most standard 48/52v Hub Motor Kits - however, be sure to always refer to your specific system amp requirements when choosing your battery, especially if using custom/higher power controllers.

 This Battery has a Reention 3 pin (aka Mini XLR) Charge Port, and optionally includes your choice of Charger. If you bundle a charger with this battery, the correct connector will be included. The Discharge Cable uses an XT90s Anti Spark Connector, but we also have adapters available if needed.


As with all our products, this battery is covered by our Comprehensive Warranty and Extended Support Plan.



  • Smart Bluetooth BMS can be monitored via iPhone or Android App
  • Customizable Cell balance Settings, will Balance at any Charge Level above 50%
  • Very Similar Size and Shape to the Standard Hailong, but uses the latest 21700 Cells for Increased Capacity and Power
  • Lockable and Quick Releases from the Mount
  • Highly Water Resistant Solid Case Provides Good Protection
  • On / Off Switch
  • Lighted Battery Lever LED Indicator (0%, 25%, 50%, 100%)
  • Reention 3 pin (aka Mini XLR) Charge Port
  • Optional Choice of Chargers
  • Approx 12" Discharge Cable Uses an XT90s Anti-Spark Connector
  • Discharge Connector Adapters Also Available HERE if you don't want XT90s


  • Capacity: 52v (58.8v Fully Charged) 15ah
  • Configuration: 14 Series 3 Parallel
  • Cells: Samsung 50E 21700 5000mAh
  • Cycle Life: 500-1500+ Cycles @ =/> 80%
  • Output: 40a Continuous Discharge (30a Recommended)
  • Input: 5a Charging Max
  • Low Voltage Cutoff: 42v
  • Weight: Approx 9.5lb (4.3kg [8.8lb Battery | .7lb Mount]
  • Dimensions: 15.2 * 3.7 * 4" (386 * 92 * 100mm) - See Diagram Photo for more Detail