Yunfan Factory Supply 18650 2500mAh 3.7V Lithium Cylindrical Cell 1C Charge 1.5C Discharge 500 Cycles Bulk Lithium Cell For Power Equipment Assembly

This 18650 3.7V 2500mAh cylindrical lithium cell is a universal rechargeable raw cell for custom battery pack assembly. It addresses common drawbacks of generic cylindrical cells including high internal impedance, weak shell durability and narrow temperature adaptability. Built with heavy-duty steel housing, it supports 1C standard charging and 1.5C high-rate discharge to meet instantaneous power demands of small portable devices. With stable cycle performance over 500 standard charge-discharge rounds and 5-year long shelf life, it delivers steady output from -20℃ to 60℃, ideal for assembling portable power tools, small storage packs and mobile monitoring equipment.

Robust Heavy-Duty Steel Shell
Thick steel casing provides anti-extrusion and shock resistance, lowering damage risks during cell transportation and pack assembly.

Stable 1C Charge & 1.5C Discharge Rate
Supports 1C fast charging and 1.5C continuous high-current discharge, matching power demands of small high-load portable equipment.

Low Internal Impedance Design
Internal impedance controlled below 60mΩ, reducing heat accumulation under continuous discharge to maintain consistent voltage output.

Long Cycle & Extended Shelf Life
Reaches no less than 500 full charge-discharge cycles under standard working conditions, with 5 years estimated shelf life for long-term stock storage.

Wide Temperature Operating Window
Stable discharge performance at -20℃ low temperature, suitable for indoor and mild outdoor portable equipment power assembly.

DIY Portable Equipment Battery Packs
Existing Drawback: Generic cells with high internal impedance produce excess heat under continuous operation, shortening finished pack service life.
Solution: Low internal impedance structure cuts heat generation for safer long-hour portable device operation.

Small Power Tool Energy Packs
Existing Drawback: Ordinary cells only support low discharge rate, unable to sustain instant high power startup of handheld power tools.
Solution: 1.5C max discharge rate fully satisfies the instantaneous high-current demand of small power tools.

Outdoor Portable Monitoring Device Power Units
Existing Drawback: Conventional cells fail to discharge stably under cold outdoor environments, limiting all-day field monitoring.
Solution: Reliable discharge performance at -20℃ supports year-round outdoor portable equipment power supply.

Small Household Emergency Backup Battery Assemblies
Existing Drawback: Thin weak cell shells deform easily during assembly and transport, causing short-circuit risks.
Solution: Heavy-duty steel shell enhances structural stability and avoids cell damage during processing and delivery.

As a professional lithium cell manufacturer, Yunfan provides full customized solutions for battery pack factories and distributors worldwide:
Sort cells by consistent voltage and internal impedance to match uniform series-parallel pack assembly requirements
Adjust cell grouping standards and pre-welding processing for customer finished battery production lines
Custom export carton printing, marking labels and batch sorting standards for bulk cell wholesale orders
Support mixed capacity cell matching and customized packaging schemes for special equipment assembly projects
Accept small trial batch orders and stable mass production supply with flexible delivery schedules

Packing
Cells separated by insulating plastic dividers inside standard export cartons to prevent short circuit and collision damage. Reinforced wooden cases are available upon request for large bulk orders. All packages carry standard lithium cell hazard labels for customs inspection.
Shipping
Complete dangerous goods certification documents support sea freight, air freight and international bulk cargo delivery. Logistics tracking number will be sent after goods dispatch, the Yunfan sales team will follow up shipment progress until clients receive the goods.