{"product_id":"maxell-er6-replacement-battery-36v-2000mah-li-socl2","title":"Maxell ER6 PLC Replacement Battery 3.6V 2000mAh Li-SOCl2","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMaxell ER6 — 3.6V Li-SOCl2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 2000mAh lithium-thionyl chloride cell that replaces the Maxell ER6 in PLCs and industrial automation controllers. It provides backup power for SRAM memory retention and real-time clock functions when mains power is interrupted. Dimensions are 54.34 × 14.10 × 14.10mm — confirm these match your existing cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePLC backup power role:\u003c\/strong\u003e\n    The ER6 does not run the PLC — it holds SRAM contents and RTC timing during power outages. Without it, the controller loses its program and clock data the moment mains power drops.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We measured open-circuit voltage at delivery, verified stable float behaviour at 3.6V, and confirmed the cell holds retention voltage under the low-microamp draw typical of PLC backup circuits.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap rule for PLC installation:\u003c\/strong\u003e\n    Always replace this cell with the PLC powered on and in RUN mode. Removing the old cell while the controller is powered off will cause SRAM loss — the program will be gone and must be reloaded from a programming device.\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  \u003cp class=\"bpw-desc-p\"\u003eMost PLCs do not reset the battery alarm automatically when a new cell is fitted. The alarm is a latched fault that must be cleared manually through the programming software — typically via the diagnostics or status buffer. On Siemens S7 controllers, this is done through STEP 7 or TIA Portal by acknowledging the battery fault in the module properties. Allen-Bradley controllers generally require a similar manual clear through RSLogix or Studio 5000.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew ER6 cell reading below 3.6V straight out of packaging\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-SOCl2 cells ship in a passivation state — the internal lithium surface develops a thin film during storage that temporarily suppresses open-circuit voltage. A fresh ER6 may read as low as 3.2V on a multimeter before installation. Once seated in the PLC and drawing the low microamp standby current, the passivation layer breaks down and voltage rises to full rated output within a few hours. No action is needed beyond installing the cell and allowing time for recovery.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415975133274,"sku":"BWCS-MER600SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415975166042,"sku":"BWCS-MER600SL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415975198810,"sku":"BWCS-MER600SL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MER600SL-1.webp?v=1779758775","url":"https:\/\/batteryweb.com\/products\/maxell-er6-replacement-battery-36v-2000mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}