IMREN 18650 Battery Charger,3.7V Battery Charger for 3.7 Volt Li-ion (2-Bay, USB-C)
Quick take
The IMREN 2-bay 3.7V Li-ion charger is built for popular round cells like 18650 and 21700, with USB-C power input and independent charging per slot (1A each). It is a good fit for vape batteries or personal electronics that use 3.7V protected/unprotected Li-ion cells, with the main caveat that the included USB cable may not be the most durable part.
Pros and cons
Pros
- USB-C input design makes it easy to run from a computer, wall adapter, or power bank (5V/2A).
- Two slots charge independently, each rated up to 1A (1000mA).
- Compatible with multiple 3.7V Li-ion sizes, including 18650 and 21700, plus several others in the same family.
- Buyers report fast, simple day-to-day charging with no obvious setup complexity.
Cons
- Capacity and fit depend on the battery length, with a stated slot support under 75mm.
- The included cable has been reported to fail sooner than expected, so you may want a sturdier replacement cable.
What buyers think
Buyer-review evidence points to a charger that is straightforward to use and capable of charging 18650-class cells (and 21700-class cells) without fuss. Multiple comments describe quick charging and reliable performance for routine use. The most notable recurring complaint theme is limited durability of the included charging cord rather than a failure of the charger body itself, so cable quality may matter if you charge frequently or move the charger often.
What this charger is, and who it is for
The IMREN 2-bay 3.7V charger is designed for single-cell Li-ion batteries that use a 4.2V charge endpoint (typical for 3.7V nominal chemistry). It is meant for round-format cells across several common sizes, including 18650 and 21700, and it can be powered from USB-C sources that provide 5V/2A.
This makes it a practical choice if you have a small battery setup, like a pair of 18650s for a device, or a mix of 18650/21700 batteries where you want one charger that can handle both. The dual-slot design is also convenient if you want to top up two cells at once while keeping charge behavior per slot.
IMREN 18650 Battery Charger specs that matter
- Battery chemistry/voltage class: 3.7V Li-ion (charge output 4.2V).
- Charging current: 2 slots, up to 1A (1000mA) per slot, with independent operation.
- Input: USB-C, 5V/2A compatible (works with power banks, computers, and USB wall/car chargers that meet the input requirement).
- Form factor: compact 2-bay charger, with a stated slot length support of under 75mm (important for size compatibility).
- Ports and cable: 2 charging bays and a Type-C connection used on the charger cable.
Compatibility and size fit (the part people forget)
The charger supports a range of 3.7V Li-ion sizes (including 18650, 18500, 16340, 14500, and larger 20700/21700, among others listed). The key practical detail is whether your specific cells fit the slot length limit (75mm support noted for the charger’s 18650-size slot).
If your batteries are longer than the slot support, they may not seat properly. Before buying, check your battery’s exact length and diameter and compare it to the slot guidance.
Charging speed and real-world expectations
With up to 1A per slot, charging should feel “fast enough” for most routine top-ups. Reviewers mention charging times under roughly a few hours for larger 21700-class cells, while others describe quick charging for everyday use. Actual time will vary based on the starting charge level, battery capacity, and whether you charge one slot or both slots simultaneously.
Pros and cons summary (when it’s a good buy)
It is a good match if you want
- A USB-C charger that can handle both 18650 and 21700-class cells in the same setup.
- A simple two-bay charger for devices like vape mods or other electronics that use 3.7V Li-ion cells.
- Independent slot charging so you can manage two batteries without complicated settings.
You might want to skip it if
- You have Li-ion cells that exceed the stated slot length support (75mm).
- You expect the included cable to take heavy daily wear and tear, since buyers have reported cord durability issues.
Price and availability
The IMREN 2-bay charger is positioned as a budget-friendly USB-C option for common 3.7V Li-ion cell sizes. If you find it near the lower end of the market, it is especially attractive for small-battery setups that need only two slots. For the latest price and stock, check the listing below.
Alternatives to consider (by use case)
If you are comparing chargers, choose based on what you need more than the brand name. Here are the main decision criteria to compare across options:
- Need more than two bays? Look for 4-bay or 8-bay chargers if you frequently cycle larger packs or run multiple devices.
- Need higher charge current? If you want faster turnaround, compare chargers that advertise higher per-slot current (while still matching 3.7V Li-ion and the right 4.2V cutoff behavior).
- Need compatibility with different chemistries? If your batteries are not 3.7V Li-ion, do not assume a “battery charger” will work. Match chemistry and voltage class first, then match size fit.
- Travel-focused setup? USB-C chargers are convenient, but also check cable quality and power requirements (5V/2A) so it works reliably with the adapters you carry.
Verdict
The IMREN 2-bay 3.7V Li-ion USB-C charger is a solid, practical pick for buyers who want a compact charger for 18650-class and 21700-class batteries with independent 1A per-slot charging. It looks best for small, everyday battery routines, and the main thing to watch is battery size fit (slot length) and the durability of the included cable if you plan to use it constantly.
FAQ
What battery sizes does the IMREN 2-bay charger support?
It is designed for 3.7V Li-ion cells across several common sizes listed for this charger, including 18650 and 21700, along with other compatible sizes in the same family. It also notes a slot length support under 75mm, so double-check your battery dimensions for proper fit.
Can I use USB-C power banks or a computer to charge it?
Yes. The charger uses USB-C input and is compatible with 5V/2A power sources such as power banks, computers, and USB wall or car chargers that meet that input requirement.
How fast does it charge?
Charging is up to 1A (1000mA) per slot, and the two bays operate independently. Real-world time depends on battery capacity and starting charge level, but buyers generally describe quick, day-to-day charging.
Does it charge only 18650 batteries?
No. The charger is intended for multiple 3.7V Li-ion battery sizes, including 21700 and other listed sizes, as long as they fit the slot length and diameter requirements.
Is it safe to charge all Li-ion batteries with this?
It is meant for 3.7V Li-ion cells that use the 4.2V charge endpoint typical for that chemistry. Do not use it for non-rechargeable batteries, and match both chemistry and size before charging.
Does it include a charging cable?
Yes, it comes with a Type-C cable. Some buyers have mentioned the included cable may be less durable over time, so if you charge frequently, consider using a higher-quality replacement cable.
Specifications
| Product Title | IMREN 18650 Battery Charger,3.7V Battery Charger for 3.7 Volt Li-ion 18650 18350 18500 16340 14500 20700 21700 26650 Battery,1A Fast USB-C 18650 Charger (2 Bay) |
|---|---|
| Category | Electronics > Household Batteries, Chargers & Accessories > Battery Chargers |
| Brand | Imren |
| Manufacturer | Hunan Aimeiren New Energy Co., Ltd. |
| Model Number | I2 |
| Color | Black |
| Product Dimensions | 4.33"D x 1.96"W x 1"H |
| Output Voltage | 4.2 Volts |
| Input Voltage | 5 Volts |
| Current Rating | 2 Amps |
| Amperage | 2 Amps |
| Connector Type Used on Cable | USB-C |
| Number of Ports | 2 |
| Item Dimensions D x W x H | 4.33"D x 1.96"W x 1"H |
| Mfr Part Number | I2 |
| External Testing Certification | CE |
| Warranty Description | 12 |
Available variants
Model
- I4
- I2
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