It had 3 old graphite style batteries in it when found. The batteries were thrown out and I don't know where comparable batteries can be found.
Vintage KD Tools D127 Voltage Electrical Tester - Made in USA
VINTAGE KD TOOLS BRAKE TOOLS 298 285 287 280
VINTAGE KD Tools Chain Exhaust Cut Off Tool K-D 2031
Vintage KD Tools Disc Brake Run Out Indicator K-D 2110 Original Box #33
VINTAGE KD TOOLS BRAKE MEASURING DEVICES DRUMS LINING 278 277 275 2326 2116
