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.

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AA and AAA On/Off Battery Holders - Keystone

Shop AA to C and D Size Battery Spacer Converter Case - EBLOfficial

AAA AA Battery Converters for sale

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

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

Uxcell AAA to AA Battery Adapter, AA to C Size Battery Adapter, Metal Contacts Clear 3 Set

AA - AAA - 9V Standard Battery Charger Sharvielectronics: Best Online Electronic Products Bangalore

The 15 Best Battery Holders to 3D Print of 2023