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18650/21700 Battery Selection Guide: Choose the Right Lithium Battery to Unlock New Business Possibilities
Cylindrical Lithium-Ion Battery Cell
Space-grade safety ensured by multi-level protection, automated manufacturing, comprehensive testing, 24/7 monitoring & big data warning. Max 2000-cycle life via modified cathode/anode/electrolyte to slow capacity fade. Volume energy density >300Wh/kg with advanced materials (high-voltage, cobalt-free, solid-state) and minimalist structure. High consistency from automated sorting/grouping, avoiding barrel effect to boost pack discharge capacity. 24/7 protection via BMS (health monitoring, internal short detection, 90% fire risk reduction) and lifecycle online warning.
In today’s era of increasingly diverse new energy application scenarios, the quality and compatibility of lithium batteries directly affect business efficiency and user experience. Enov (Huizhou) New Energy Technology Co., Ltd., as a high-tech enterprise focusing on the lithium-ion battery field, integrates R&D, production, marketing, and after-sales services. With profound technical accumulation and strict quality control, it provides comprehensive solutions for B-end customers. This selection guide will help you quickly match suitable products and avoid common pitfalls based on core needs.
I. Clarify 3 Core Selection Dimensions First
1. Scenario Adaptation as Priority
Different application scenarios have significantly different performance requirements for lithium batteries, requiring targeted matching:
Portable electronics (power banks, lighting, monitoring): Focus on capacity stability and lightweight design, prioritizing models with low internal resistance and long cycle life.
Power equipment (power tools, garden tools, scooters): Core focus on discharge rate and instantaneous power, requiring high-rate continuous output capability.
Energy storage (portable energy storage, UPS power supplies, solar energy storage): Emphasize energy density and safety protection, prioritizing products with high specific energy and long service life.
2. Key Parameters Cannot Be Ignored
Capacity: Take “nominal capacity” as the core reference, and reserve 10%-20% redundancy to avoid experience impact due to insufficient capacity in actual use.
Rate: Continuous rate determines equipment operating efficiency, while instantaneous rate affects peak performance. Select according to the rated power of the equipment.
Cycle life: Directly related to usage costs. Prioritize products with a cycle life of ≥300 cycles; for high-frequency use scenarios, choose models with ≥500 cycles.
Safety: Confirm that the product has overcharge, short circuit, and high-temperature protection functions.
3. Balance Between Cost and Service
Cost-effectiveness: Calculate comprehensively based on unit price, service life, and maintenance costs. Avoid pursuing low prices alone, which may lead to frequent failures later.
After-sales support: Prioritize suppliers with professional pre-sales consulting and rapid after-sales response to ensure timely problem resolution.
II. Recommended Hot Product Selections
Enov New Energy focuses on cylindrical lithium-ion batteries, covering two mainstream series: 18650 and 21700. The following are recommended adaptations for high-frequency B-end scenarios:
18650 Series: High Versatility for Multiple Scenarios
18650-2600mAh (Digital Type): Nominal capacity 2600mAh, cycle life ≥500 cycles, internal resistance ≤48mΩ. Suitable for portable devices such as power banks, lighting, monitoring, and laptops, with excellent cost-effectiveness.
18650-33H: Nominal capacity 3300mAh, continuous rate 3C, instantaneous rate 5C. Suitable for power tools, garden tools, and smart homes, with stable power output.
18650-25H: Nominal capacity 2500mAh, continuous rate 8C, instantaneous rate 10C. Specifically designed for high-frequency, high-power demand power tools, with strong durability.
21700 Series: High Capacity & High Power, Preferred for Power and Energy Storage
21700-40H: Nominal capacity 4000mAh, continuous rate 8C, instantaneous rate 10C. Suitable for outdoor portable power stations, fast-charging power banks, and electric bicycles, with outstanding endurance.
21700-4500mAh-3C: Nominal capacity 4500mAh, cycle life ≥800 cycles, internal resistance ≤18mΩ. Balances high capacity and long life, suitable for energy storage equipment and electric scooters.
21700-5000mAh: Nominal capacity 5000mAh, continuous rate 2C, instantaneous rate 3C. High energy density, suitable for portable energy storage and household appliances with high endurance requirements.
III. 3 Key Points to Avoid Pitfalls in Selection
Reject “false parameter labeling”: Confirm that product parameters are consistent with test reports, focusing on verifying core indicators such as capacity, rate, and cycle life to avoid adaptation failures due to false labeling.
Value safety certifications: Prioritize enterprises certified by ISO9001, ISO14001, and ISO45001 systems. Products must have complete safety test reports to eliminate potential safety hazards.
Confirm supply stability: Choose suppliers with complete production bases and sufficient production capacity. Enov has R&D centers and production bases in Guangdong, with a daily output of one million lithium batteries, ensuring continuous supply.
IV. Core Advantages of Enov New Energy
(I) Core Layer: Cell Manufacturing and Technology Upgrade Opportunities
Technical strength: Boasts an international R&D team of over 90 people, cooperating with renowned universities at home and abroad. Successfully developed semi-solid-state batteries with a volumetric energy density exceeding 300Wh/kg, leading the industry in technology.
Production guarantee: 25℃ constant temperature workshops + MES manufacturing execution system + four-level strict testing, ensuring stable performance and high quality consistency of each battery cell.
Service support: 3 global service centers, providing customized solutions, one-on-one pre-sales consulting, and rapid after-sales response, escorting cooperation throughout the process.
Choosing the right lithium battery is the foundation for efficient business operations. With triple guarantees of technology, production capacity, and service, Enov New Energy provides cost-effective and highly compatible lithium battery products for small and medium B-end customers.
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Battery CELLs
18650
● Appearance: Cylindrical
● Shell: Nickel-plated Steel Shell
● Weight ≈ 46g
● Diameter < 18.5mm
● Height ≤ 65.3mm
21700
● Appearance: Cylindrical
● Shell: Nickel-plated Steel Shell
● Weight ≈ 69.5g
● Diameter < 21.7±0.3mm
● Height ≤ 70.8mm
LiFePo4 Battery Cell (Lithium Iron Phosphate battery cell)
Lithium iron phosphate, featuring high safety, long lifespan, excellent cycling performance, and being the main focus for high-rate and wide-temperature application scenarios.
LCO Battery Cell (Lithium cobalt oxide battery cell)
Lithium cobalt oxide has a very high energy density and a stable discharge plateau. It is mainly used in consumer electronics and has applications in fields such as UAV.
NCM Battery Cell (Nickel Cobalt Manganese Oxide battery cell)
Nickel-cobalt-manganese ternary lithium, with high energy density, excellent rate and low-temperature performance, balanced performance and cost.