Anritsu FAQs
I bought a new battery for my Site Master but when I plug it in it says Battery Cal Lost.
The battery designed to work with the Site Masters has circuitry that communicates with the mother board. If you bought an off the shelf battery it will not have this circuitry and will display this message. If it is a battery was bought from Anritsu then you may need to contact an Anritsu service center.