The Weltool INR18-33 18650 flat-top lithium-ion battery is a high-capacity rechargeable power source designed for reliable and efficient performance in various devices. Built as part of the Weltool INR series, these batteries utilize original lithium-ion cells without additional protection circuits. As a result, users must take care to avoid overcharging or over-discharging the battery during use, ensuring optimal performance and longevity. This flat-top 18650 battery stands out with its robust capacity, high discharge current, and durability, making it an excellent choice for demanding applications.

The INR18-33 model boasts a nominal capacity of 3300mAh and a typical capacity of 3200mAh, providing consistent energy output for devices that require steady and dependable power. With a nominal voltage of 3.60V, this battery ensures compatibility with a wide range of electronics. Its internal resistance is rated at ≤25mΩ, contributing to efficient energy transfer and minimal power loss during operation. This low resistance enhances the overall performance of the battery, particularly in high-demand situations.

Designed to handle various operating conditions, the Weltool INR18-33 excels in both standard and extreme environments. At room temperature (0~35°C), the battery supports a continuous discharge current of up to 9.9A, catering to power-intensive devices. In more challenging conditions, such as low temperatures ranging from -25°C to 0°C or high temperatures between 35°C and 45°C, the continuous discharge current is rated at 3.3A. This adaptability makes the INR18-33 suitable for diverse applications, from everyday electronics to specialized equipment requiring stable performance in varying climates.

Charging the INR18-33 is straightforward and efficient. The standard charging current is set at 1.65A, which is ideal for temperatures between 5°C and 15°C. This controlled charging rate ensures that the battery maintains its integrity and avoids potential overheating or stress. The overcharge protection voltage is specified at 4.2V (±0.05V), while the over-discharge protection voltage is set at 2.5V (±0.05V). These precise limits help safeguard the battery from conditions that could otherwise compromise its functionality or lifespan.

One of the standout features of the Weltool INR18-33 is its durability over time. Even after 800 cycles of charging and discharging, the battery retains 70% of its original capacity. This impressive cycle life highlights its reliability for long-term use, making it a cost-effective and environmentally friendly option for users who depend on high-quality rechargeable batteries. The ability to maintain substantial capacity after numerous cycles underscores the INR18-33’s advanced design and manufacturing standards.

The battery operates within a wide temperature range, ensuring consistent performance in both hot and cold conditions. It can be safely charged at temperatures between 0°C and 45°C and discharged at temperatures ranging from -20°C to 60°C. This versatility makes it suitable for applications in various environments, whether indoors or outdoors, and across different climates.

In terms of physical specifications, the INR18-33 is compact and lightweight, with dimensions of 18.35mm (±0.15mm) in diameter and 65.05mm (±0.15mm) in length. Weighing approximately 48g (±2g), it fits comfortably into most devices designed for 18650 batteries, offering a balance of portability and power. Its flat-top design ensures compatibility with a variety of electronics, particularly those that require a secure and stable connection.

The absence of an additional protection circuit in the Weltool INR18-33 emphasizes its suitability for experienced users who are familiar with managing lithium-ion batteries safely. Proper care, such as using appropriate chargers and avoiding extreme charging or discharging conditions, is essential to maximize the battery’s performance and lifespan. This focus on efficiency and user responsibility reflects the battery’s professional-grade design.

Overall, the Weltool INR18-33 18650 flat-top lithium-ion battery is a high-performance power solution that combines impressive capacity, durability, and adaptability. Its ability to deliver consistent energy output across a wide range of conditions makes it a versatile choice for powering various devices. With proper handling and care, the INR18-33 provides a dependable and long-lasting energy source for both everyday use and specialized applications. Its compact size, lightweight construction, and reliable performance make it an invaluable component for users seeking top-tier rechargeable battery technology.

Battery model: INR18-33
Nominal capacity: 3300mAh
Typical capacity: 3200mAh
Internal resistance: ≤25mΩ
Nominal voltage: 3.60V
Continuous discharge current at room temperature: 9.9A (0~35℃)
Continuous discharge current at low or high temperature: 3.3A (-25~0℃) or (35~45℃)
Standard charging current: 1.65A (5℃~15℃)
Overcharge protection voltage: 4.2±0.05V
Over-discharge protection voltage: 2.5±0.05V
After 800 cycles of charge and discharge, the battery still retains 70% capacity
Charging temperature: +0~+45℃
Discharging temperature: -20~+60℃
Battery size: 18.35±0.15mm (diameter), 65.05±0.15 mm (length)
Weight: 48±2g

SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.

For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.

Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.

If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.

Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.

Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.

Learn more,Please click on Here.

To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.

Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.

Discount products：
No product return for discount products

Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.

Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.

Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty

Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.

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