https://tinkersphere.com/batteries-holders/1597-c-battery-holder-with-sewable-tabs.html
$0.75 - C Battery Holder with Sewable Tabs - Tinkersphere
Pop your C battery into this holder for an easy way to attach wires or sew with conductive thread to power your projects. Provides 1.5V of power.
c batteryholdersewabletabs