Sleeves and spacers turn AA or AAA batteries into C- or D-cell

Sleeves and spacers reliably allow you to use AA or AAA batteries with C or D gadgets.

4PCS Battery Adapter Holder Shell Converter Switcher Adaptor AA to C Size Convertor Exchanger Case Large Strength Battery - AliExpress

Star Product - RS Components

Battery Eliminator - AAA Wired / Active Cell - fake AAA battery with wires

lr621 battery holder ag1, lr621 battery holder ag1 Suppliers and Manufacturers at

Genuine Lithium Batteries for DIY Projects – Battery Hookup

Quick hack: The $1 C-to-D adapter

8 Slot LED Battery Charger Suitable for AA/AAA C / D Rechargeable Batteries Charging Adapter Short Circuit Protection - AliExpress

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Mighty Max Battery 12V 35AH Pride Jet 3 Ultra Power WheelChair Rechargeable Sealed Lead Acid 12350 Backup Power Batteries (2-Pack) in the Device Replacement Batteries department at

Bundle of 10 pcs,Material:ABS,13g for each one Each Battery converter for 31*58mm(12.2*22.8) ,AA to D Battery Whether large or small capacity

10 Pack AA to D Size Battery Spacer Converter Case, Sackorange D Size Battery Adapter Spacers Case for Rechargeable Battery

AA to D AAA to AA Battery Conversion Adapter Holder Plastic Switcher Case Box

Selecting an Appropriate Coin Cell Battery Holder