www.g-tronic.com : Back up batteries, parts and spare parts for Siemens plc controls Simatic S5 and S7
Replacement Battery 6ES7971 1AA00 0AA0 SAFT LS14250 1/2AA 3.6V For Siemens S7 300 PLC Lithium Battery|Uninterrupted Power Supply| - AliExpress
5 X 6Es7971-1Aa00-0Aa0 Plc Battery 3.6V For Siemens S7-300 Ls14250C Plc - SPW Industrial
6ES7971-1AA00-0AA0 Siemens | Siemens - Battery for use with S5-90U Series, SIMATIC S7-300 Series | 628-888 | RS Components
SIMATIC S7-300, CPU 315-2DP 1998-03-15... 1999-05-01 SIMATIC S7-300, CPU 315-2 DP CPU WITH INTEGRATED 24 V DC POWER SUPPLY, 64 KBYTE WORKING MEMORY 2ND INTERFACE DP-MASTER/SLAVE 16-Bit Single-Chip Microcontroller ...
Lot For Siemens S7-300 6ES7971-1AA00-0AA0 3.6V PLC Replacement Battery | eBay