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Panasonic INR18650-BD

Panasonic INR18650-BD

Technical Specifications

Cell Type: Lithium-ion rechargeable cylindrical cell (18650 format) 
Nominal Voltage: 3.60 V
Typical Capacity: ~3,180 mAh (minimum 3,030 mAh)
Dimensions: Diameter max ~18.50 mm, Height max ~65.30 mm
Weight: ≤ ~49 g

Max Charge Voltage: 4.20 V
Discharge Cut-off Voltage: 2.50 V

Max Continuous Discharge Current: Up to ~10 A 
Operating Temperature Range:

Charge: +10 °C to +45 °C

Discharge: –20 °C to +60 °C

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Key Performance Highlights

  1. Balanced Energy & Power: ~3,180 mAh nominal capacity per spec.
  2. 10 A Discharge Capability: Supports continuous discharge up to 10 A.
  3. Widest Operating Temperature: Discharge range from –20 °C to +60 °C.
  4. Long Cycle Life (Improved Version): Over 1,500 cycles at 1 It (according to Panasonic’s improved BD spec) with >81% capacity retention.
  5. Flexible Charge Strategy: Can be safely charged at 4.15 V (less stress) without requiring a State‑of‑Health (SOH) check.
  6. High Reliability & Safety: Designed for stable performance, low self-discharge, and cost‑efficient system design.
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Frequently Asked Questions

What is the operating temperature range?

  • Charge: 0 °C to 45 °C (per DNK Power)
  • Discharge: –20 °C to 60 °C

What charging strategy is recommended?

  • Use CC‑CV charge up to 4.20 V. (Datasheet supports this)
  • For longevity, the “Improved BD” cell supports modest current (e.g., ~0.3 C) to optimize cycle life.
  • According to Panasonic’s improved-cycle flyer, SOH (state-of-health) checks are not required in many use cases, simplifying BMS design.

INR21700 50S 5000mah cell packing and delivery

  • Original Pallet and Carton package. Made in Korea or China.
  • Packing quantity:130pcs/carton, 99 cartons/pallet,12870pcs/pallet, 10 pallets/20GP container, 20 pallets/40GP container.
  • Delivery terms: by air, by sea, FOB, CIF, DDP, DDU
  • Delivery time: Approx. 7 working days after receiving the payment.

What BMS / protection design should be used?

  • Include over-current protection, especially around 10 A or above.
  • Voltage cut‑offs: use cut-off settings around 4.2 V (charge) and ~2.5 V (discharge) as per datasheet.
  • Since the cell is rated for a wide temperature range in discharge, thermal monitoring (thermistors) in the pack is highly recommended.
  • Because the “Improved” BD doesn’t need a strict SOH check, you can simplify your pack’s health monitoring design if you follow Panasonic’s recommended cycle conditions.

What do independent labs / users report?

  • Batemo’s characterization confirms the safe operating voltage range (2.5 V–4.2 V) and realistic thermal boundaries.
  • According to Panasonic’s improved BD specs, the cell’s low-temperature performance (–20 °C) maintains ~71% capacity at 1 It discharge.
  • Some industrial distributors note that the BD cell combines a rare balance of capacity + cycle life + cost-efficiency, making it a solid choice for energy storage designs.

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