{"product_id":"fuji-electric-micrex-f-replacement-battery-36v-1200mah-li-socl2","title":"Fuji Electric MICREX-F PLC Compatible Battery 3.6V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFuji Electric MICREX-F \/ MICREX-SX Series — 3.6V Li-SOCl2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V lithium-thionyl chloride cell replaces the internal backup battery in Fuji Electric MICREX-F, MICREX-SX, MICREX-SPB, and MICREX-SPH programmable logic controllers, plus 18 additional compatible models. Capacity is 1200mAh (4.32Wh). It maintains SRAM program memory and real-time clock data when main power is removed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMICREX platform compatibility:\u003c\/strong\u003e\n    All listed MICREX variants share the same 3.6V backup rail and cell footprint (26.36 × 15.50 × 14.60mm). The BMS in each controller expects the stable open-circuit voltage characteristic of Li-SOCl2 chemistry to confirm cell presence and clear the low-battery alarm flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under the continuous low-drain load typical of PLC SRAM retention circuits. The cell held voltage within spec throughout, and the BMS registered a valid cell state without triggering a battery fault condition.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure for MICREX controllers:\u003c\/strong\u003e\n    Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is powered off collapses the SRAM voltage rail instantly. If that happens, the program is gone and must be reloaded from a connected programming device.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MICREX-F battery alarm won't clear after a confirmed good installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eOn MICREX controllers, the low-battery alarm flag is latched in firmware — it does not clear automatically when a new cell is detected. After fitting the replacement cell, you must navigate to the battery status register in the programming software and manually reset the alarm flag. Some MICREX-SX configurations also require a PLC restart after the flag is cleared before the status indicator on the front panel goes out. If the alarm persists after both steps, confirm the cell connector is fully seated — a partially engaged connector reads as an open circuit and re-latches the fault immediately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew cell reading below 3.6V on the PLC diagnostics screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-SOCl2 cells ship in a passivation state — a thin lithium chloride layer forms on the anode during storage and suppresses the initial open-circuit voltage. On the PLC diagnostics screen this can appear as a low or marginal battery reading within the first hours of installation. The cell does not need replacing. Leave the controller powered on and allow the passivation layer to break down under the low-level float current from the PLC's backup circuit. Voltage should stabilise at or above 3.5V within a few hours of normal powered operation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415973527642,"sku":"BWCS-MMC520SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415973560410,"sku":"BWCS-MMC520SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415973593178,"sku":"BWCS-MMC520SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MMC520SL-1.webp?v=1779758775","url":"https:\/\/batteryweb.com\/products\/fuji-electric-micrex-f-replacement-battery-36v-1200mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}