21700 3.2V 3000-3500mAh LiFePO4 Rechargeable Battery

High Safety LFP Rechargeable Lithium Ion Cylindrical Battery

$4.00

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Key Features:

3000-3500mAh high capacity, 3.2V, flat discharge curve for stable power
Advanced LiFePO4: 350-500℃ thermal stability, no fire/explosion risk
Long cycle life: ≥2500 cycles (80% DOD), 10-12-year service life
Wide temperature adaptability: -20℃~60℃ discharge, fit extreme environments
No memory effect, charge at any state, easy to use
Eco-safe, non-toxic, RoHS compliant
1.5C fast charge, fully charged within 40 minutes

Core Advantages:

Superior safety: Safer than ternary lithium, anti-overcharge/short-circuit, optional PCB protection
Cost-effective: High cycle life, low self-discharge (≤3%/month at 25℃), low maintenance cost
Strong compatibility: Flexible series/parallel, fits high-power devices and energy storage
High consistency: Strict quality control, 100% pre-delivery inspection
Durable: Thick steel casing, anti-puncture/impact, suitable for outdoor/industrial use
Global certifications: Meets export standards, safe for shipment worldwide

Rechargeable Cylindrical Battery structure drawing

Applications:

Energy Storage: Solar/wind storage, UPS, home/telecom backup power
Electric Tools: Wireless drills, grinders, impact wrenches
Light Electric Vehicles: E-bikes, scooters, golf trolleys, electric wheelchairs
Smart Devices: Robot vacuums, industrial robots, high-capacity portable electronics

Parameter	Detail
Battery Type	21700 Cylindrical LiFePO4 Rechargeable Battery
Nominal Voltage	3.2V (LiFePO4 standard)
Capacity Range	3000-3500mAh (3.2V, 0.2C discharge)
Charge Method	CC/CV, 0.5C standard, 1.5C fast charge available
Charge Voltage	3.65V ± 0.05V (3.60V recommended for longer life)
Discharge Cut-off Voltage	2.5V (avoids over-discharge damage)
Max Continuous Discharge Current	3C (9A-10.5A) (5C for customized high-power version)
Cycle Life	≥2500 cycles (80% DOD, 25℃); ≥3500 cycles (premium)
Operating Temperature	Charge: 0℃-50℃; Discharge: -20℃-60℃
Storage Temperature	-20℃-55℃ (≤1 year, 50% SOC)
Dimensions (D×H)	21.0mm±0.2mm × 70.0mm±0.3mm
Internal Resistance	≤80mΩ (25℃, 1KHz)

21700 3.2V 3000-3500mAh LiFePO4 Rechargeable Battery is a high-capacity cylindrical LFP battery, upgraded from 18650 with larger size and higher energy density. Featuring superior safety, stable discharge, long cycle life and wide temperature adaptability, this standardized 21700 (21mm×70mm) battery supports flexible series/parallel combination, providing cost-effective, reliable power for industrial, commercial and consumer electronics worldwide.