Amazon.com: Siemens 6ES7 212-1AE40-0XB0 SIMATIC S7-1200, CPU 1212C, COMPACT CPU, DC/DC/DC, ONBOARD I/O: 8 DI 24V DC; 6 DO 24 V DC; 2 AI 0-10V DC, POWER SUPPLY: DC 20.4-28.8 V DC,
2003) Siemens Xelibri 6 aka the powder pad phone...couldn't find a battery for it as of now : r/vintagemobilephones