The Weltool UB21-50 battery – a revolutionary power source that combines cutting-edge technology with exceptional reliability to deliver unparalleled performance in a wide range of applications. Whether you're powering high-drain devices or relying on dependable backup power, the UB21-50 battery sets a new standard for lithium-ion battery performance.

Innovative Design for Enhanced Safety and Durability

Unlike traditional Li-ion batteries with nickel plate connections for negative protection circuits, the Weltool UB21-50 features built-in protection circuitry integrated into the battery positive, enhancing safety and durability. The steel shell, riveted and integrated with the battery core, effectively prevents short circuits caused by collisions or wear, without increasing the battery's diameter.

The Type-C USB charging interface, located within the positive protection circuit, offers versatile charging options. Simply connect the battery to a 5V adapter or high-current USB port on a computer or mobile power source using a USB charging cable. Additionally, the battery can be charged using a compatible charger. The charging indicator on the battery provides real-time feedback on the charging status, ensuring hassle-free operation.

High Performance for Demanding Applications

The UB21-50 battery is powered by selected 21700 Li-ion battery cells with low internal resistance, high capacity, and a large discharge current, making it ideal for powering high-drain devices such as flashlights, headlamps, and more. With a continuous discharge current of 14.5A (at 10-25°C), the UB21-50 battery delivers reliable power output even in demanding conditions.

Triple overheat protection mechanisms, including pressure safety valve protection, diaphragm micro-hole protection, and PTC cathode blocking protection, ensure optimal safety during operation. The battery's positive protection circuit provides additional safeguards against overheating, overcharging, over-discharging, and short circuits, enhancing user confidence and peace of mind.

Versatile Compatibility and Robust Construction

The UB21-50 battery is designed for compatibility with a wide range of devices, including flashlights and other electronic devices that require reliable power sources. Its raised positive cap ensures a secure connection with flashlight contacts, while the robust surface labeling process enhances durability and safety.

With a capacity of 5000mAh and dimensions of 21.4mm (diameter) and 76mm (length), the UB21-50 battery strikes the perfect balance between performance and portability. Weighing just 73g, it is lightweight and compact, making it easy to carry and transport wherever your adventures take you.

In conclusion, the Weltool UB21-50 5000mAh Rechargeable Lithium-ion Battery represents the pinnacle of battery technology, offering unmatched performance, safety, and reliability for a wide range of applications. Whether you're a professional user in need of dependable power sources or an outdoor enthusiast seeking reliable backup power, the UB21-50 battery is your trusted companion for all your power needs. Invest in the Weltool UB21-50 battery and experience the difference it can make in your daily life.

• Model: UB21-50
• Capacity: 5000mAh
• Internal resistance: ≤50mΩ
• Voltage: 3.6V
• Continuous discharge current : 14.5A（10-25 ℃）
• Charging current: 2A (Type-C USB interface charging current), 3.4A (Max. charger charging current)
• Overcharge protection voltage: 4.25±0.05V
• Over-discharge protection voltage: 2.5±0.1V
• Cycle charge and discharge times: 300 times, the battery has 80% capacity
• Charging indicator: red light (charging), blue light (charged)
• Charging temperature: 0-45 ℃
• Discharge temperature: -20-55℃
• Storage temperature: -20-55℃
• Dimensions: 21.4±0.2 mm (diameter), 76±0.2 mm (length)
• Weight: 73±0.5g

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.

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.

Learn more,Please click here.