{"product_id":"dynabook-286-replacement-battery-36v-2700mah-li-mno2","title":"Dynabook 286 PLC Replacement Battery 3.6V 2700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDynabook 286 \/ 386 PLC — 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 Dynabook 286 and 386 series Programmable Logic Controllers. It maintains SRAM retention and real-time clock operation during mains power interruptions. Voltage and capacity match factory specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e286 and 386 series compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, voltage rail, and SRAM retention circuit. The 60.55 × 18.50 × 18.35mm cell form factor fits either controller without modification to the housing or connector.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed stable open-circuit voltage at 3.6V and verified that the BMS handshake with the retention circuit holds correctly under simulated low-draw SRAM backup conditions. No false battery-fault signals were triggered during test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure — critical for this PLC:\u003c\/strong\u003e\n    Always replace this cell while the controller is powered on and in RUN mode. Removing the battery with the PLC powered off will immediately erase SRAM contents. If that happens, a full program reload from the connected programming device is required before the controller can return to service.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePLC losing program memory after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSRAM in the Dynabook 286 and 386 series has no capacitor buffer — the battery is the sole retention source. The moment the old cell is disconnected with the controller powered off, SRAM voltage collapses and all stored program data is lost. Hot-swapping with the PLC live prevents this entirely. If memory was lost, reconnect the programming device, reload the last confirmed program backup, and verify I\/O mapping before returning the controller to RUN mode.\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 Dynabook PLC battery alarm flag is set in software, not hardware — installing a new cell does not automatically clear it. After replacement, the alarm must be acknowledged and reset manually through the programming software. Connect the programming device, navigate to the diagnostic or status register, and clear the battery fault flag explicitly. Until that step is completed, the controller will continue to report a battery fault regardless of actual cell condition.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415968612442,"sku":"BWCS-PLB386SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415968645210,"sku":"BWCS-PLB386SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415968677978,"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\/dynabook-286-replacement-battery-36v-2700mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}