Nitecore UI2 Charger

Nitecore UI2 Charger Review

In the world of rechargeable batteries, true intelligence isn’t just about speed—it’s about preservation. The Nitecore UI2 Intelligent USB Charger is meticulously engineered with this philosophy at its core. This portable, dual-slot battery charger is more than a simple power delivery device; it’s a sophisticated battery care system designed to protect your investment and maximize the cycle durability of your valuable Li-ion cells. With its unique low-current charging mode, expansive compatibility, and a host of advanced safety features, the UI2 is the ultimate companion for users who prioritize battery health and on-the-go versatility.

The Revolutionary Low-Current Charging Mode

The crowning achievement of the Nitecore UI2 is its intelligent dual-mode charging capability. When you insert a healthy Li-ion battery with a voltage over 2.9V, the UI2 enters its Standard Mode, providing a steady and efficient 800mA maximum charging current. However, its true genius is revealed when it encounters a deeply discharged battery. Cells with a voltage below 2.9V are vulnerable; charging them too aggressively can cause irreversible damage to their internal chemistry.

The UI2 automatically detects this critical state and switches to its specialized Low Current Charging Mode. In this mode, it delivers a gentle, restorative current of just 100mA. This slow and careful process safely revives the battery, gradually bringing its voltage back up to a stable level without the shock of a high-current charge. This feature not only activates over-discharged batteries that other chargers might reject but also actively works to extend their overall lifespan, ensuring you get the most out of every cell.

Unrivaled Compatibility and Ultimate Portability

The UI2 was built for the real world, offering phenomenal compatibility that covers a vast range of 3.7V rechargeable Li-ion batteries. From common sizes like the 18650 to less common ones, its flexible design ensures a secure fit. Crucially, it is fully compatible with the larger 20700 and 21700 batteries that power many of today’s high-performance vaping mods and flashlights, making it a true all-in-one solution for enthusiasts.

This versatility is matched by its incredible portability. Powered by a standard USB input, the UI2 liberates you from the wall outlet. You can power it from a laptop, a power bank, a 5V solar panel, or any USB adapter. This makes it the perfect travel charger, easily slipping into a bag or pocket and providing reliable charging wherever you go. The included USB cable ensures you’re ready to power up right out of the box.

A Comprehensive Suite of Safety Protections

Nitecore has fortified the UI2 with an array of protective features to ensure a safe and reliable charging process every time. The intelligent circuitry automatically selects between CC (Constant Current) and CV (Constant Voltage) charging modes and terminates the current immediately upon completion to prevent overcharging. It features robust reverse polarity protection, which prevents damage if a battery is inserted backward, and anti-short circuit protection for complete peace of mind.

The physical design is equally focused on safety. The UI2 is constructed from durable and fire-retardant PC materials and incorporates an optimal heat dissipation design. During the charging process, integrated thermal protection actively monitors the temperature to prevent overheating, safeguarding both the charger and your batteries. With the UI2, you can charge with the absolute confidence that you and your equipment are protected by multiple layers of advanced safety technology. The Nitecore UI2 is not just a charger—it’s an intelligent, portable, and protective tool for the discerning battery user.

Specifications: 

• Portable USB Battery Charger
• Compatible for 3.7V rechargeable Li-ion batteries
• Available for low current charging below 2.9V
• USB Input
• Automatic adoption for the optimal charging modes between CC and CV
• Automatic termination upon charging completion
• Reverse polarity protection and anti-short circuit protection
• Thermal protection during the charging process
• Activates over-discharged batteries with protection circuits
• Compatible with power banks, 5V solar panels, and USB adaptor
• Made from durable and fire retardant PC materials
• Optimal heat dissipation design
• Included Accessory: USB Charging Cable

Package Contents Include:

• 1x Nitecore UI2 USB Charger
• 1x Power Cord
• 1x Instructional Manual

WARNING:

• Never use your battery chargers for batteries other than the ones described and detailed on the package in which it came.
• Making attempts to charge batteries other than what the charger calls for is seriously threatening and may even cause bodily injury. Because batteries contain Lithium-Ion, serious damage can occur if improperly used.
• Carefully read the battery charger’s instruction manual as well as the safety information provided to you.  Adhere to all of the directions and proper operation of the charger within the manual.
• Only use your battery charger indoors. Exposing your charger to high/low outdoor temperatures or high humidity can ruin the charger.
• Do not store or expose this charger to water.
• Never take apart or tamper with the battery charger.
• Do not expose your battery charger near open flames.
• Do not leave batteries unattended.