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.

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

D cell, C cell, AA cell, Dummy battery spacer, Adapter, converter.

Adapting AAA and AA to C and D?

3pcs AAA to AA/ AA to C/ AA to D Battery Combination Cell Battery Box Adaptor AAA AA Holder Case Converter Switch

Relay 6VDC 10A 1 x on / (on) - REL 0610 C

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

EASY DIY AA To D Cell Battery Spacers Battery Hack

Meh: Panasonic Eneloop Battery Power Pack

EBL C and D Size Battery Adapters, AA to C and D Size Battery Spacer Converter Case Use with Rechargeable AA Battery Cells - Batteries Are Not

EBL AA to C and D Size Battery Spacer Converter Case

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

Eurocard Connectors

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

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