{"product_id":"ge-fanuc-30i-replacement-battery-3v-1750mah-li-mno2","title":"GE Fanuc 30i PLC Replacement Battery 3V 1750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGE Fanuc 30i \/ 31i \/ 32i \/ 35i-B — 3V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3V lithium-manganese dioxide cell rated at 1750mAh (5.25Wh), sized to fit GE Fanuc 30i, 31i, 32i, and 35i-B CNC control systems. It maintains SRAM and real-time clock backup when main power is disconnected. Without a functional cell, the controller loses program data, tool offsets, and timing information on the next power cycle.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFanuc 30i-series compatibility:\u003c\/strong\u003e\n    The 30i, 31i, 32i, and 35i-B all share the same backup battery housing, connector, and voltage rail. One cell spec covers the full family with no wiring changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the SRAM float-charge circuit and confirmed stable BMS behaviour across the expected backup voltage window. The cell holds voltage within the controller's retention threshold throughout its discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure — required on Fanuc 30i-series:\u003c\/strong\u003e\n    Always replace this battery with the CNC controller powered on and in RUN mode. Removing the cell while the machine is off clears SRAM immediately. If the swap happened with power off, a full program reload from the programming device is required before the machine can return to service.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePLC battery alarm not clearing after a confirmed good installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eFanuc 30i-series controllers do not auto-clear the battery alarm when a new cell is seated. The alarm flag is written to a specific PMC data address and stays active until cleared manually in the programming software. Navigate to the PMC maintenance screen, locate the battery alarm status bit, and reset it while the controller is powered on. Skipping this step leaves the alarm active even though the cell is good and the SRAM is protected.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew cell reading below 3V on the controller's diagnostic screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 cells ship at a storage voltage, typically 2.80–2.95V, to slow self-discharge during transit. Once seated, the controller's float-charge circuit brings the cell up to its nominal 3V within a few hours under normal operating conditions. A reading below 3V immediately after installation is not a fault. Check the diagnostic screen again after the machine has been running for two to four hours — the voltage should read at or above 3.0V before the next scheduled shutdown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415983587418,"sku":"BWCS-PLC026SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415983620186,"sku":"BWCS-PLC026SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415983652954,"sku":"BWCS-PLC026SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC026SL-1.webp?v=1779758841","url":"https:\/\/batteryweb.com\/products\/ge-fanuc-30i-replacement-battery-3v-1750mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}