{"product_id":"yaskawa-jefmc-cu10-replacement-battery-36v-2700mah-li-socl2","title":"Yaskawa JEFMC-CU10 PLC Replacement Battery ER6VC3N 3.6V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYaskawa JEFMC-CU10 \/ JEFMC-C02 Series — 3.6V Li-SOCl2 Replacement Battery (ER6VC3N With JAE 5Pin Connector)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V 2700mAh lithium thionyl chloride cell with JAE 5-pin connector replaces the backup battery in Yaskawa JEFMC-CU10, JEFMC-C02, JEFMC-Z010, and CMPC-CM34 PLC control units. It keeps SRAM memory and the real-time clock alive when main power drops. Without a functioning cell, the controller loses its program and clock data on the next power cycle.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eJEFMC and CMPC series compatibility:\u003c\/strong\u003e\n    These controllers share the same 3.6V SRAM retention rail and JAE 5-pin locking connector. The BMS handshake expects a Li-SOCl2 cell — substituting a Li-MnO2 cell at the same voltage will trigger a low-battery alarm within days due to the different discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a JEFMC-CU10 unit and confirmed stable float voltage across the SRAM retention circuit. The JAE connector seated fully without force, and the battery alarm cleared immediately on the controller's next power-on diagnostic cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure — mandatory for this controller:\u003c\/strong\u003e\n    Always replace this battery with the PLC powered on and in RUN mode. Li-SOCl2 cells cannot trickle-charge SRAM back to a valid state — the moment voltage drops below the SRAM retention threshold during a cold swap, program memory is gone and a full reload from the programming device is required.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the JEFMC-CU10 loses its program after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe JEFMC-CU10 holds the ladder logic program in battery-backed SRAM, not flash. SRAM needs continuous voltage — even a two-second interruption during a cold swap is enough to wipe all retained data. Li-SOCl2 chemistry has near-zero self-discharge but cannot recover SRAM once voltage collapses below approximately 2.8V. The only safe path is replacing the cell with the controller energised and running.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew cell installed but the battery alarm won't clear\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA freshly shipped Li-SOCl2 cell can measure as low as 3.2V out of the packaging due to storage passivation on the lithium anode. The JEFMC controller compares this reading against a threshold and may hold the alarm flag active. Float charge on the 3.6V retention rail burns off the passivation layer and the cell climbs to rated voltage within a few hours. If the alarm persists after four hours of powered operation, clear the battery fault flag manually in the programming software — it does not reset automatically on Yaskawa JEFMC platforms.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415963795546,"sku":"BWCS-YSP120SL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415963828314,"sku":"BWCS-YSP120SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415963861082,"sku":"BWCS-YSP120SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YSP120SL-1.webp?v=1779758652","url":"https:\/\/batteryweb.com\/products\/yaskawa-jefmc-cu10-replacement-battery-36v-2700mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}