{"product_id":"fanuc-18-t-series-programmable-logic-controllers-replacement-battery-6v-2400mah-li-mno2","title":"Fanuc A98L-0031-0025 PLC Replacement Battery 6V 2400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFanuc 18-T Series PLC — 6V Li-MnO2 Replacement Battery (A98L-0031-0025)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 6V lithium-manganese dioxide cell replaces the OEM backup battery in Fanuc 18-T series programmable logic controllers, Robot controllers, and ALPHA\/BETA iSV CNC system amplifiers. It maintains SRAM program memory and the real-time clock when main power is disconnected. Capacity is 2400mAh (14.4Wh), matching the original cell specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCross-platform Fanuc compatibility:\u003c\/strong\u003e\n    The 18-T series, Robot controllers, and iSV amplifier lines all draw from the same 6V backup rail and share the BR-2\/3AGCT4A cell format. One part number covers all of them because the BMS handshake and connector are identical across this generation of Fanuc hardware.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the backup rail under simulated power-loss conditions. The BMS held stable voltage above the SRAM retention threshold throughout the test cycle, and the real-time clock retained its values on restoration of main power.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap requirement on Fanuc controllers:\u003c\/strong\u003e\n    Always replace this cell with the controller powered on and in RUN mode. Removing the battery while the PLC is powered off collapses the SRAM supply instantly — program memory is gone and a full reload from the programming device will be required before the machine can run.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Fanuc 18-T battery alarm won't clear after a new cell is fitted\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eOn Fanuc 18-T series controllers, the low-battery alarm is latched in software — it does not clear automatically when voltage recovers. After fitting a new cell, the alarm must be reset manually through the MDI panel or programming software. Navigate to the system diagnostics screen and acknowledge the battery alarm flag directly. Skipping this step leaves the alarm active even with a fully charged cell installed.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew cell reading below 6V on the Fanuc diagnostic screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 cells are shipped at storage voltage, which typically sits between 5.6V and 5.8V. Once installed, the cell rises to its nominal 6V on the controller's float charge over several hours — this is normal cell behaviour, not a fault. Do not pull and test a freshly installed cell with a standalone meter and discard it based on that reading. Check the diagnostic screen again after four hours of powered operation; voltage should read at or above 5.9V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415978147930,"sku":"BWCS-PLC980SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415978180698,"sku":"BWCS-PLC980SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415978213466,"sku":"BWCS-PLC980SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC980SL-1.webp?v=1779758818","url":"https:\/\/batteryweb.com\/products\/fanuc-18-t-series-programmable-logic-controllers-replacement-battery-6v-2400mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}