IMREN 18650 Battery Charger 4-Bay USB-C - Smart Fast Charging

In this review the IMREN 18650 Battery Charger is judged as a practical, no-frills 4-bay charger for people who need flexible charging for both 3.7V Li-ion and 1.2V Ni-MH/Ni-Cd cells. The single biggest reason to buy is its combination of wide battery compatibility and selectable charge currents up to 2000mA, which lets hobbyists, flashlight owners and general power-tool users recharge a variety of sizes without pairing batteries. It is a sensible, portable USB-C powered unit that favors versatility over premium finish.

Key Features

• Wide compatibility: Supports many sizes including 26650, 21700, 18650, 14500 and Ni-MH AA/AAA, so one charger covers most household and hobby cells.
• Four independent bays: Each slot charges independently so any number of batteries can be charged at once without pairing, which helps extend battery life.
• Adjustable charge current: Offers 0.5A, 1A and 2A modes selectable with the MODE button, enabling faster charging for high-capacity cells or gentler charging for smaller cells.
• USB-C powered portability: The USB-C input and included Type-C cable make it easy to power from a phone adapter, car USB or power bank for on-the-go use.
• Long 75mm slots: Slots accept batteries up to 75mm in length so most button-top 21700 and many large cells fit comfortably.
• Automatic battery identification: The charger detects Li-ion versus Ni-MH/Ni-Cd and charges different chemistries simultaneously and separately.

Who It's For

This charger is best for gadget owners, flashaholics, or anyone who maintains a mixed collection of rechargeable batteries and needs a single, portable charger that handles both 3.7V Li-ion and 1.2V Ni-MH cells. It is useful when users want to charge one, two or four batteries independently and appreciate the option to increase current for faster top-ups.

It is less well suited for users who require premium safety certification records or a charger with advanced diagnostics and guaranteed long-term durability; some customers reported inconsistent build life and variable full-charge results, so those needing the highest reliability for expensive cells may want a commercial or higher-end model.

Pros & Cons

Pros

• Very versatile battery support across many sizes and both Li-ion and Ni-MH chemistries.
• Independent bay charging and selectable 0.5A/1A/2A currents add flexibility for different batteries.
• USB-C power input and included cable make it convenient for travel and varied power sources.
• 75mm long slots accommodate many large cells used in modern devices.

Cons

• Some users reported mixed charging completeness and concerns about long-term build quality, so expect variable results between units.
• Not positioned as a premium safety/diagnostics charger compared with higher-end models.

Specifications

Input	DC 5V/2A via USB-C
Output	Li-ion: 4.2V; Ni-MH/Ni-Cd: 1.48V
Charge current options	0.5A / 1A / 2A (selectable)
Slot length	Up to 75mm
Supported cells	26650, 22650, 21700, 20700, 18650, 18500, 18350, 17670, 17500, 16340, 14500 and AA/AAA/C (Ni-MH/Ni-Cd)
Typical charge times	18650 3000mAh: ~1.5H one battery at 2A, ~3H two batteries; 26650 5000mAh: ~2H one battery, ~4H two batteries

Our Verdict

The IMREN 4-bay USB-C charger is a practical value choice for users who need broad compatibility and flexible charge rates in a portable package. It handles both Li-ion and Ni-MH cells independently and offers a useful fast-charge option, making it good value for hobbyists and everyday users; those needing the most rigorous long-term reliability or advanced diagnostics should consider higher-end alternatives.

Frequently Asked Questions

Can I charge different battery types at the same time?
The charger automatically detects Li-ion and Ni-MH/Ni-Cd chemistry and can charge different types simultaneously in separate bays.

Does it support 21700 and 26650 cells?
Yes, the 75mm slot length supports many 21700 and 26650 batteries, though fit can vary by button-top shape.

What power source is required?
Use a 5V/2A USB-C supply such as a phone adapter, car USB or power bank; the Type-C cable is included.