{"product_id":"mitsubishi-m70-replacement-battery-36v-2600mah-li-mno2","title":"Mitsubishi M70 PLC Replacement Battery 3.6V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMitsubishi M70 — 3.6V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V, 2600mAh lithium manganese dioxide cell replaces the backup battery in the Mitsubishi M70 PLC. It maintains SRAM program memory and the real-time clock during power loss. Without a functioning cell, the controller loses stored data and clock synchronisation the moment mains power drops.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eM70 controller backup rail:\u003c\/strong\u003e\n    The M70 uses a dedicated 3.6V backup rail to sustain SRAM and the RTC independent of the main power supply. This cell connects directly to that rail. Li-MnO2 chemistry holds a flat discharge curve across the full backup window, which keeps the retention voltage above the SRAM threshold until mains power is restored.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under simulated backup load and confirmed the BMS held output voltage stable above the 3.0V SRAM retention floor throughout the discharge cycle. No voltage sag or early cutoff was recorded.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eLive-swap procedure for the M70:\u003c\/strong\u003e\n    Always replace this battery with the PLC powered on and in RUN mode. Removing the cell while the controller is off will erase SRAM immediately — the backup rail has no capacitor bridge. If the swap was made with power off, a full program reload from the programming device is required before restart.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the M70 loses program memory after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSRAM on the M70 is volatile — it needs continuous voltage from either the main supply or the backup cell to retain data. There is no supercapacitor buffer on this platform. If the old cell is removed even briefly while the PLC is off, the SRAM contents are gone. The only recovery path is reloading the program from a connected programming device before attempting to restart the controller.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm not clearing after a confirmed good installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe M70 latches the battery fault flag in firmware — it does not auto-clear when a new cell is detected. After fitting the replacement with the PLC live, the alarm must be manually reset through the programming software or the controller's maintenance screen. A new cell reading slightly below 3.6V at installation is normal — Li-MnO2 ships at storage voltage and rises to rated voltage within a few hours on the PLC float charge. Confirm cell voltage is climbing before assuming a fault.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415981097050,"sku":"BWCS-PLC266SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415981129818,"sku":"BWCS-PLC266SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415981162586,"sku":"BWCS-PLC266SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC266SL-1.webp?v=1779758817","url":"https:\/\/batteryweb.com\/products\/mitsubishi-m70-replacement-battery-36v-2600mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}