I received my Super Pilot today. Meter and case are like new. It specifies a PX13 battery and with a little research found it to be the same as the 625. Lots of info out there:
http://www.smallbattery.company.org.uk/sbc_px625.htm
http://silverbased.org/zinc-mercury-replacement/
www.butkus.org/chinon/batt-adapt-us.pdf