{"product_id":"hyundai-super-286-replacement-battery-36v-2700mah-li-mno2","title":"Hyundai SUPER 286 PLC Replacement Battery 3.6V 2700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHyundai SUPER 286 \/ SUPER 286C — 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 backup battery in the Hyundai SUPER 286 and SUPER 286C programmable logic controllers. It powers the SRAM and real-time clock during mains outages, keeping the program intact and the clock running. Fit the cell with the PLC live — removing it while the controller is powered off will erase SRAM instantly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSUPER 286 and SUPER 286C compatibility:\u003c\/strong\u003e\n    Both controllers use the same battery bay, voltage rail, and backup circuit topology. A single 3.6V Li-MnO2 cell satisfies the SRAM hold current and RTC float charge for both variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed the cell seats correctly, makes clean contact with the battery terminals, and that the backup circuit draws steady hold current within the expected microamp range without BMS interruption.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap is mandatory on the SUPER 286:\u003c\/strong\u003e\n    Always replace this battery with the controller powered on and in RUN mode. The SUPER 286 has no capacitor buffer to hold SRAM during a cold swap. A cold swap means a full program reload from the programming device before the controller will run again.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SUPER 286 loses its program after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SUPER 286 holds its ladder logic in volatile SRAM. That SRAM needs a continuous voltage above roughly 2.0V to retain data. The moment the backup cell is disconnected and no mains power is present, SRAM collapses within milliseconds. Unlike some controllers that include a supercapacitor to bridge the gap, the SUPER 286 relies entirely on the lithium cell for backup. Swap the cell only while the PLC is powered on to keep mains voltage feeding the SRAM throughout the exchange.\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 SUPER 286 battery alarm flag is latched in software — it does not reset automatically once the new cell is seated. After fitting the replacement battery, connect the programming device, navigate to the system diagnostics or special registers, and manually clear the battery alarm bit. If the cell was also installed cold and the program was lost, reload the program first, then clear the alarm. Failing to clear the flag will leave the controller reporting a fault even though the new cell is reading the correct voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415971102810,"sku":"BWCS-PLB386SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415971135578,"sku":"BWCS-PLB386SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415971168346,"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\/hyundai-super-286-replacement-battery-36v-2700mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}