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Eight clear plastic AAA holders and eight black 18650 sleeves

Unique-Bargains

Unique-Bargains 3x1.5V AAA Battery Converter & 18650 Sleeve Set 8pcs

SKU CH-JT91-XKFSM

Connects three 1.5V AAA cells in series for 4.5V output and includes sleeves to fit 18650 batteries securely in flashlights

  • Battery TypeBattery Converter
  • Converts three AAA cells into a single 4.5V power source for flashlights
  • 5mm diameter holder fits lights designed for larger battery compartments
  • 5mm and 64mm lengths match common flashlight tube depths
  • Clear and black plastic sleeves protect 18650 cells from inner wall impact
  • Eight adapters and eight sleeves included for multiple devices or spares

3x AAA Battery Converter & 18650 Sleeve Set

This set provides eight plastic adapters that connect three AAA cells in series to deliver 4.5V output. It also includes eight clear and black sleeves sized at 21.5mm diameter to secure 18650 batteries inside flashlights designed for larger holders. The components suit users who power LED flashlights with either cell configuration.

Thermals, Noise and Power Draw

Passive plastic construction means no active cooling, no fan noise and zero self-consumption. The adapters simply route current from the installed cells to the device, so thermal behaviour depends entirely on the batteries used. Normal use adds no audible or electrical overhead to the flashlight.

Build Fit and Clearance

Each converter measures 61.5mm or 64mm in length and 0.85 inch across, matching flashlights that accept 3xAAA carriers. The 18650 sleeves expand the cell diameter to prevent rattling and protect the tube wall from impact. Batteries are not included, so buyers must supply their own AAA or 18650 cells.

Highlights

  • Converts three AAA cells into a single 4.5V power source for flashlights
  • 5mm diameter holder fits lights designed for larger battery compartments
  • 5mm and 64mm lengths match common flashlight tube depths
  • Clear and black plastic sleeves protect 18650 cells from inner wall impact
  • Eight adapters and eight sleeves included for multiple devices or spares

Specifications

BrandUnique Bargains
Battery TypeBattery Converter

Questions about this item

How do I install the AAA holder and 18650 sleeve in my flashlight, and what step is often missed?

Insert three AAA cells into the holder, observing the marked polarity so they connect in series and deliver 4.5V, then place the holder into the flashlight tube; if using an 18650 instead, slide the clear sleeve over the cell first to take up the 21.5mm diameter gap before inserting it.

What maintenance or replacement will the converter set need over time?

The plastic holder and sleeves have no moving parts; simply inspect the contacts for corrosion and the sleeve for cracks after heavy use, replacing any piece that shows wear or no longer grips the 18650 firmly.

What limit appears first when the adapter runs continuously in a high-drain LED flashlight?

The three AAA cells in series hit their current limit well before the plastic housing overheats, so sustained high output will sag as the 1.5V cells deplete.

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