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Clear plastic AAA battery holder and black 18650 sleeve tube set

Unique-Bargains

Unique-Bargains 3×AAA to 18650 Adapter & Sleeve Set

SKU CH-V20F-WPY9P

Holds three AAA cells in series to deliver 4.5 V for flashlights, and includes a clear and black plastic sleeve that expands an 18650 battery to 21.5 mm diameter for a snug fit

  • Battery TypeBattery Converter
  • Connects three AAA cells in series for 4.5V output
  • 5mm diameter adapter fits flashlights designed for 18650 batteries
  • 5mm and 64mm length options suit different flashlight bodies
  • Clear plastic sleeve protects 18650 battery from inner wall impact
  • Batteries not included — add your own AAA or 18650 cells

3×AAA to 18650 adapter and sleeve set

This set provides a plastic holder that connects three 1.5 V AAA cells in series to deliver 4.5 V output. A clear sleeve is also included to increase the diameter of an 18650 cell so it fits snugly in flashlights designed for the larger holder.

Holder outputs 4.5 V and sleeve prevents battery

The adapter case measures 21.5 mm in diameter and 61.5 mm in length, while the sleeve reaches 64 mm. Together they let a flashlight accept either three AAA cells or a single 18650 cell without the smaller battery rattling against the tube wall.

Fits flashlights with 21.5 mm holder bays

The critical dimension is the 21.5 mm outer diameter of the AAA holder; the flashlight’s battery compartment must accommodate this width. Buyers whose lights have narrower tubes or who need higher voltage than 4.5 V cannot use this set.

Highlights

  • Connects three AAA cells in series for 4.5V output
  • 5mm diameter adapter fits flashlights designed for 18650 batteries
  • 5mm and 64mm length options suit different flashlight bodies
  • Clear plastic sleeve protects 18650 battery from inner wall impact
  • Batteries not included — add your own AAA or 18650 cells

Specifications

BrandUnique Bargains
Battery TypeBattery Converter

Questions about this item

Does the plastic AAA holder or the 18650 sleeve wear out and need replacing over time?

The set is made of plastic; the holder connects three AAA cells in series for 4.5 V output and the sleeve simply spaces an 18650 cell. Neither part has moving components, so routine replacement is not expected.

What stops the sleeve from working when a flashlight runs continuously?

The sleeve is a passive 21.5 mm diameter plastic tube 64 mm long. Its only limit is physical fit inside the flashlight body; it does not generate heat or regulate current.

Does the adapter or sleeve get hot or make noise during all-day flashlight use?

Both parts are plain plastic with no electronics. They produce no noise and no measurable heat; any warmth comes from the batteries themselves, not the converter.

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