If you have a Simpson 160 VOM and your 22.5V battery dies, instead of paying $12-25 for a new one, stack 13 AG10s and two AG12 1.5V button batteries in shrink wrap.
Exell 412A 22.5V Alkaline Battery (Replaces ANSI / NEDA-215 and IEC-15F20) | Batteries and Power | Exell at Unique Photo
Exell Battery Alkaline 412a Multimeter Batteries in the Device Replacement Batteries department at Lowes.com
Gardner Bender Battery Tester for 1.5-Volt Button Cell to 22.5-Volt Photo and Lantern Cells GBT-500A - The Home Depot