Easy to Install:Nothing Complicated, Just Stick the AAA Battery and AA Battery in the Converter. AAA Battery Can Replace AA Battery to Use.
eBay
Power Wheel Adapter for Ryobi 18V Battery with Fuse DIY Battery Adapter Power Connector for Ryobi 18V Nimh/Nicd/Li-ion Battery
Aliexpress UK
The item is a set of 4pcs battery adapter converter cases, which are specially used to connect four AAA batteries together for replacing a large C battery. Can convert any size AAA battery to a size C battery.
eBay
Power Wheel Adapter for Ryobi 18V Battery with Fuse Battery Adapter Power Connector for Ryobi 14.4V 18V Nimh/Nicd/Li-ion Battery
Aliexpress UK
LED indicator shows the charging progress: 25%-50%-75% -100%. Slot: 4-slot. Charging Current: 300mA. 1 x Charging Cable. Compact and lightweight, plug and play, easy and simple to use. The colors may be a little difference for the different monitor display.
eBay
MT20MN Battery Adapter For Makita 18V Li-ion Battery To Ni-Mh Ni-Cd For Makita Replacement Adapter Converting Battery
Aliexpress UK
Size: 48.7mm(height)X13.2mm(width).
eBay
Bonacell Battery Adapter For Dewalt DCB200 Battery to Dyson V6/V7/V8 Adapter with Dyson V6/V7/V8 Series Lithium Tool Batteries
Aliexpress UK
This AAA to AAA adapter case converts a AAA battery to a standard AA battery size. The weight of an AA/AAA alkaline battery is normally about 23/7.5 grams, while our adapter weighs 3.5 grams. Together they weigh 11 grams, which results in a weight reduction of 12 grams.
eBay
Battery Adapter for Milwaukee 18V Battery Adaptor with USB Charger & Type-C PD Power Source Charger for Milwaukee 18V Battery
Aliexpress UK
Features: The AAA battery eliminators to replace AAA Batteries, providing a convenient and cost effective solution for powering your devices. Input USB5V, one black battery output is 4.5V, two black batteries output is 3V, and the yellow virtual battery is 0V, only used as a conductor.
eBay
Battery Adapter MT20DL Converter for Makita 18V Li-ion Battery to for Dewalt 18V/20V Li-ion Battery Adapter Cordless Power Tools
Aliexpress UK
Option to use 1 AAA to C,2 AAA to C,3 AAA to C, 4 AAA to C. Small size, easy to carry. The batteries in the pictures are not included.
eBay
MIL18DL Battery Adapter for Milwaukee 18v Lithium Battery Convert to for DeWalt 18V 20v Max Lithium Power Tools Battery Adapter
Aliexpress UK
This AAA to AAA adapter case converts AAA battery to standard AA battery size. The AA/AAA alkaline battery weight are normally about 23/7.5 gram while our adapter weighs 3.5 grams. The inner of the adapter fits one AAA battery.
eBay
Bonacell Battery Adapter For Milwaukee M18 18V Battery to Dyson V6/V7/V8 Adapter with Dyson V6/V7/V8 Series Li-ion Tool Battery
Aliexpress UK