{"product_id":"siemens-delta-servo-driver-replacement-battery-36v-2600mah-li-socl2","title":"Siemens S6-C4 PLC Backup Replacement Battery 3.6V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSiemens Delta Servo Driver — 3.6V Li-SOCl2 Replacement Battery (S6-C4)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 2600mAh lithium thionyl chloride cell for the Siemens Delta Servo Driver (S6-C4 \/ S6-C4A). It backs up SRAM program memory and the real-time clock when main power is removed. Without a functioning cell, the controller loses its program and clock data the moment mains power drops.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDelta Servo Driver memory retention:\u003c\/strong\u003e\n    The S6-C4 rail supplies SRAM hold voltage and RTC tick current simultaneously. Both functions draw from the same cell, so a depleted battery causes both program loss and clock reset — not one or the other.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the S6-C4A BMS handshake. The cell held 3.6V under the standby load, the BMS accepted the new cell without fault, and the alarm flag cleared after a manual reset in the programming software.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure for the S6-C4:\u003c\/strong\u003e\n    Always replace this battery with the servo driver powered on and in RUN mode. Removing the cell while the controller is de-energised drops the SRAM voltage to zero instantly. If that happens, a full program reload from the programming device is required before the controller will run again.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePLC losing program memory after battery swap on the Delta Servo Driver\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSRAM on the S6-C4 platform has no capacitor buffer — the cell is the only retention source. The moment cell voltage drops below the SRAM hold threshold (typically 2.0V on this class of controller), all stored data is gone. A new cell restores voltage, but it cannot recover data that was already lost. Swap with power on to keep the SRAM rail live throughout the exchange.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm not clearing after fitting a confirmed good S6-C4 cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Delta Servo Driver latches the low-battery alarm in firmware — fitting a new cell does not auto-clear the flag. After installation, connect the programming device and manually reset the battery alarm in the controller's diagnostic or status register. If the alarm reappears within 24 hours, check that cell voltage has risen to 3.6V; Li-SOCl2 cells ship at storage voltage and can read slightly low for the first few hours on float charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415966187610,"sku":"BWCS-SDR640SL-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415966220378,"sku":"BWCS-SDR640SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415966253146,"sku":"BWCS-SDR640SL-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SDR640SL-1.webp?v=1779758652","url":"https:\/\/batteryweb.com\/products\/siemens-delta-servo-driver-replacement-battery-36v-2600mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}