{"product_id":"yamaha-prcx-replacement-battery-36v-4500mah-ni-mh","title":"Yamaha PRCX PLC Backup Compatible Battery 3.6V 4500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYamaha PRCX \/ QRCX \/ RCX Series — 3.6V Ni-MH Replacement Battery (KS4-M53G0-102)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V, 4500mAh Ni-MH cell replaces the backup battery in Yamaha PRCX, QRCX, RCX40, and RCX142 industrial controllers. It maintains SRAM program memory and the real-time clock during power outages and scheduled maintenance. Cross-references OEM part numbers KS4-M53G0-101, KS4-M53G0-200, and N3000CR-3YA.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePRCX \/ QRCX \/ RCX platform fit:\u003c\/strong\u003e\n    These controllers share the same backup circuit voltage rail, connector footprint, and BMS handshake protocol — one cell covers the full group. Physically, the replacement matches OEM dimensions (76.65 × 50.40 × 26.16mm), so no bracket modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the PRCX backup circuit under simulated mains loss. The BMS held SRAM at retention voltage without fault flags across repeated power-interruption cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap is mandatory on this controller:\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 erases SRAM instantly — program data is gone and a full reload from the programming device is required. There is no grace period.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the PRCX loses program memory after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe PRCX holds its ladder logic and parameter data in SRAM, which requires continuous voltage to retain contents. Unlike flash-based controllers, SRAM drops all data the moment supply voltage falls below the retention threshold — typically around 2.0V. If the old cell was removed while the controller was off, even a two-second gap clears memory completely. The only recovery path is reloading the program from a connected programming device or a saved backup file.\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\"\u003eFitting a new cell does not automatically clear the battery alarm on the PRCX — the controller latches the fault flag in software and holds it until a manual reset is performed in the programming environment. Navigate to the system diagnostics or status register in your programming software and clear the battery fault bit explicitly. A power cycle alone will not reset it. After clearing, confirm the alarm stays off through at least one full scan cycle before closing the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415974051930,"sku":"BWCS-YHG102SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415974084698,"sku":"BWCS-YHG102SL-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415974117466,"sku":"BWCS-YHG102SL-3","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YHG102SL-1.webp?v=1779758819","url":"https:\/\/batteryweb.com\/products\/yamaha-prcx-replacement-battery-36v-4500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}