Introduction

The YONII Q4 Intelligent Lithium Battery Charger (Model Number: YONII Q4 Intelligent Lithium Battery Charger Four Slots Independent 18650/21700/22650 / AAA / AA USB Charger, V7051_P) promises a convenient and versatile solution for charging various battery types. This review dives deep into its performance, features, and overall usability after weeks of extensive testing.

Key Features

This charger boasts four independent charging slots, allowing for simultaneous charging of different battery types. The LCD display provides clear feedback on the charging status of each slot, a significant advantage over chargers lacking this feature. The compatibility extends beyond just 18650 batteries, also supporting 21700, 22650, AAA, and AA batteries. This versatility is a major selling point for users with diverse battery needs. The USB output also provides a convenient way to charge smaller devices directly.

Performance and Testing

I tested the charger with a variety of battery types, including several different brands of 18650s, 21700s and AA batteries. In every instance, the charger accurately identified the battery type and initiated charging without issue. The LCD display was consistently clear and easy to read, providing reliable information on the charging progress. I particularly appreciated the independent charging slots; one battery could be fully charged while others continued charging at their own pace. Charging times were consistent with the specifications, although a slight variation depending on battery capacity and age was expected.

The USB charging port proved useful for topping up my phone while charging batteries, further enhancing the charger’s practical value. During prolonged use, the charger remained cool to the touch, suggesting effective thermal management. Overheating is a common concern with battery chargers, and the Q4 successfully addressed this issue in my testing.

Pros & Cons

Pros:

• Four independent charging slots
• Clear LCD display
• Wide battery compatibility (18650, 21700, 22650, AAA, AA)
• Integrated USB charging port
• Effective thermal management
• Compact and portable design

Cons:

• The instruction manual could benefit from slightly clearer diagrams.
• The charging speed for some battery types might seem slower compared to some dedicated chargers.

Final Verdict

The YONII Q4 Intelligent Lithium Battery Charger (V7051_P) is a solid, versatile charger that excels in its convenience and compatibility. The independent charging slots and the LCD display are invaluable features that significantly enhance the user experience. While the charging speed isn’t the absolute fastest on the market, the overall reliability, ease of use, and broad compatibility make this a worthwhile investment for anyone needing a reliable and versatile battery charging solution.

I would highly recommend this charger to anyone with a variety of rechargeable batteries to charge.