Imren 4‑Bay USB‑C Battery Charger — Universal 18650/21700 Charger, 75mm Slots & Selectable 0.5/1/2A

If you use removable batteries for flashlights, EDC lights, vaping devices, or power tools, this compact four‑slot charger handles a wide range of sizes from AAAA up to 26650 and supports single‑slot charging so cells never need to be paired. The charger automatically identifies Li‑ion versus Ni‑MH/Ni‑Cd chemistry, adjusts current accordingly, and offers a 75mm slot depth for longer cells like 21700 and 26650. It includes a Type‑C cable for flexible USB power sources on the go.

How does the IMREN charger protect and identify different battery types?

The charger uses built‑in detection to recognize Li‑ion and Ni‑MH/Ni‑Cd cells and applies appropriate charging behavior for each chemistry. It monitors each slot independently so mixed chemistry and mixed capacities can be charged simultaneously without forcing paired charging.

• Automatic chemistry identification for correct charge profile.
• Individual slot monitoring to prevent overcharge and imbalance.
• Intelligent current adjustment based on connected USB input.
• Do not use with non‑rechargeable batteries; always follow safety guidance in the manual.

What charging speeds and options are available?

You can choose from three charge currents — 0.5A, 1A, and a 2A fast‑charge mode — using the mode button, with two slots defaulting to 1A. The 2A option is handy for quickly topping large Li‑ion cells, while 0.5A is gentler for smaller or older batteries to preserve longevity.

• Selectable 0.5A, 1A, 2A charge rates via mode button.
• Default two slots set to 1A; switch to 2A for fast charging when needed.
• Suitable currents for both small Ni‑MH cells and large 21700/26650 Li‑ion cells.
• Fast charging requires adequate USB power source (PD/2A capable recommended for 2A mode).

Can I charge mixed sizes or one battery at a time?

Yes — each bay is independent so you can charge any combination of supported sizes without pairing requirements. The long 75mm slots accept taller cells such as 21700, 20700, 26650, and many protected or button‑top variants.

• Single‑slot charging allowed; no need to insert batteries in pairs.
• 75mm slot depth fits up to 26650 and long 21700 cells with button tops.
• Charge Li‑ion and Ni‑MH cells at the same time in different bays safely.
• Compact footprint for desktop or travel use with USB‑C power sources.

What do I get in the box and how do I power it on the go?

The package includes the IMREN 4‑bay charger, a Type‑C cable, and a user manual. Because it’s USB‑C powered, you can use phone adapters, power banks, laptops, or car chargers — making it convenient for travel or field use.

• Contents: IMREN 4‑bay charger, USB‑C cable, user manual.
• USB‑C input works with common USB chargers and power banks for portability.
• Compact size that fits in a gear bag alongside spare batteries and devices.
• Always follow the manual and avoid charging non‑rechargeable cells.

Who this is for: the IMREN 4‑bay USB‑C charger is aimed at enthusiasts and professionals who keep multiple removable cells on hand — flashlight owners, hobbyists, technicians, and anyone who wants a flexible charger for a wide range of Li‑ion and Ni‑MH sizes. It’s especially useful when you need to charge single cells of different chemistries or larger 21700/26650 cells while traveling or working remotely with USB power sources.