{"product_id":"els-el5242w-replacement-battery-36v-2700mah-li-mno2","title":"ELS EL5242\/W PLC Backup Compatible Battery 3.6V 2700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eELS EL5242\/W — 3.6V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V 2700mAh lithium manganese dioxide cell replaces the memory backup battery in the ELS EL5242\/W programmable logic controller. It maintains SRAM program data and real-time clock function during mains power loss. When the original cell degrades, the PLC can lose stored logic and timing data at the next outage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEL5242\/W memory backup circuit:\u003c\/strong\u003e\n    This cell sits on a dedicated backup rail that powers only the SRAM and RTC. The voltage window for reliable retention is narrow — the EL5242\/W begins flagging low battery well before the cell reaches cutoff, giving a maintenance window before data loss risk.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the EL5242\/W backup circuit under simulated mains-off conditions. The BMS held stable float behaviour and the controller logged no memory fault across repeated power interruption cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure — critical for this PLC:\u003c\/strong\u003e\n    Always replace this battery with the EL5242\/W powered on and in RUN mode. Removing the cell while the controller is powered off will clear SRAM immediately. If that happens, a full program reload from the connected programming device is required before the controller can resume normal operation.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the EL5242\/W battery alarm does not clear after a confirmed good installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe EL5242\/W does not automatically cancel the battery low alarm once a new cell is fitted. The alarm flag is written to a status register in the controller and must be cleared manually through the programming software. Simply installing a fresh cell at rated voltage is not enough — the software acknowledgement step is separate. Navigate to the system diagnostics or status flags section of the programming interface and reset the battery alarm bit directly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew cell reading below 3.6V on first installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 cells ship at storage voltage, which typically measures 3.3V–3.5V out of the packaging. This is normal — the cell is not faulty. Once seated in the EL5242\/W backup circuit, the controller's float charge brings the cell to full rated voltage within a few hours. If the voltage has not risen above 3.5V after 12 hours in a powered and running controller, check the battery contact pins for oxidation and confirm the cell is fully seated. Target resting voltage is 3.6V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415970087002,"sku":"BWCS-PLB386SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415970119770,"sku":"BWCS-PLB386SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415970152538,"sku":"BWCS-PLB386SL-3","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLB386SL-1.webp?v=1779758775","url":"https:\/\/batteryweb.com\/products\/els-el5242w-replacement-battery-36v-2700mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}