LISHEN-21700

The LISHEN 21700 Series Cylindrical Lithium-Ion Bare Cell Lineup delivers high energy density, outstanding discharge flexibility, and robust cycle longevity for professional battery pack builders, e-mobility integrators, and industrial energy storage systems. Featuring Tianjin Lishen Battery industrial-grade cylindrical cells across popular models—including the high-capacity factory-fresh LR2170SZ (5000mAh, 15A), high-current powerhouse LR2170LA (4000mAh, 45A), and cost-effective LR2170SD (5000mAh, 10A)—these flat-top bare cells provide stable 3.6V/3.7V nominal platforms and low internal resistance for balanced multi-series and parallel pack construction.

Key Features:

• Tier-1 Industrial Quality: Manufactured by Tianjin Lishen Battery with tight internal resistance sorting and consistent voltage curves across production batches.
• High-Drain & High-Capacity Spectrum: Select from massive 5000mAh capacity cells (LR2170SZ/LR2170SD) for extended range, or extreme 45A high-drain cells (LR2170LA) for heavy motor and power-tool loads.
• Modern 21700 Form Factor: Precision dimensions (approx. 21.2mm diameter × 70.3mm length) offering superior volumetric energy density and better thermal dissipation than standard 18650 cells.
• Flat Top Terminal Design: Clean, unraised flat-top positive terminals engineered specifically for manual or automated spot-welding with nickel strips.
• Superior Thermal Stability: Premium electrode chemistry ensures efficient heat dissipation and robust cycle longevity under demanding duty cycles.

Specifications & Model Lineup:

• Brand: LISHEN
• Cell Format: 21700 Cylindrical Bare Cell
• Dimensions: Approx. 21.2 mm (Diameter) × 70.3 mm (Length)
• Positive Terminal: Flat Top (Bare, unprotected cell)
• Nominal Voltage: 3.6V – 3.7V per cell
• Maximum Charge Voltage: 4.20V ± 0.05V per cell
• Discharge Cut-off Voltage: 2.5V per cell
• Popular Models in Collection:
  • LR2170SZ (New): 5000mAh nominal capacity, 15A continuous discharge current, lime green wrap.
  • LR2170SD (Reclaimed Grade-A): 5000mAh nominal capacity, 10A continuous discharge current, purple wrap.
  • LR2170LA (Reclaimed Grade-A): 4000mAh nominal capacity, 45A high-drain continuous discharge current, lavender blue wrap.

Package Options:

• 1 PCS: Single cell option for sampling, bench testing, or single-cell replacement needs.
• 10 PCS: Entry pack for compact DIY power banks, cordless tools, and small portable modules.
• 20 PCS: Ideal quantity for building 10S2P lightweight e-scooter or 4S5P portable power stations.
• 50 PCS: Standard volume bundle for multi-series e-bike batteries and medium energy storage systems.
• 100 PCS: Full factory case for professional pack builders, bulk fleet maintenance, and large-scale parallel battery banks with closely matched factory batch IR.

Safety & Usage Restrictions (Important Bare-Cell Notice):

• Unprotected Bare Cell Warning: These are bare industrial cylindrical cells without built-in protection circuit boards (no PCM / PCB).
• Professional Assembly Only: Strictly intended for qualified technicians and pack assemblers who integrate an appropriate Battery Management System (BMS) with overcharge, over-discharge, over-current, and cell balancing protection.
• Never Carry Loose Cells: Do not carry loose cells in pockets, bags, or toolboxes where contact with keys, coins, or metal items can cause catastrophic short circuits. Always store in non-conductive plastic battery cases.
• Prohibited Consumer Uses: Not for loose consumer use in flashlights, vaping devices, or household appliances lacking dedicated cell containment and BMS protection.
• Charging Protocol: Charge exclusively using dedicated CC/CV lithium-ion smart chargers (0.5C to 1C rate recommended). Never exceed 4.20V per cell and never leave charging batteries unattended.
• Pre-Weld Inspection: Verify equal cell voltages and inspect shrink wrap insulation prior to resistance spot-welding. Never solder directly onto cell terminals with a soldering iron.

Reclaimed Cell Quality Terms:

For reclaimed/refurbished cell models (LR2170SD and LR2170LA), cells are harvested from unused factory modules, electronically tested, and sorted for Grade-A capacity and internal resistance. We offer a 3-month quality warranty on cell integrity. Builders must verify and balance all cell voltages prior to pack welding.

Recommended Applications:

• Electric Bicycles (E-Bikes), Electric Scooters, and E-Motorcycles
• High-Drain Cordless Power Tools, Vacuums, and Lawn Equipment
• Custom DIY Multi-Series/Parallel Lithium Battery Packs
• Off-Grid Solar Energy Storage Systems (ESS) and UPS Backup
• Robotics, AGVs, and Portable Electronics Stations

Why Choose DXF:

DXF POWER delivers rigorously tested lithium-ion cylindrical cells with strict internal resistance and voltage sorting, ensuring reliable multi-cell pack balancing and secure protective packaging for worldwide delivery.