Thorlabs - T505 Replacement 22.5 V Alkaline Battery for DET1-SI and DET2-SI
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.
Eveready 504 or NEDA 220 15V Alkaline Battery – Repairs And Spares