{"product_id":"panasonic-fp2-replacement-battery-3v-1200mah-li-mno2","title":"Panasonic FP2 AFP8801 PLC Backup Compatible Battery 3V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePanasonic FP2 \/ FP3 \/ FP10 — 3V Li-MnO2 Replacement Battery (AFP8801)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3V, 1200mAh lithium-manganese dioxide cell that replaces the AFP8801 backup battery in Panasonic FP2, FP3, and FP10 programmable logic controllers. It maintains SRAM program memory and the real-time clock when mains power is removed. When the original cell depletes, the PLC loses retained data — this cell restores that backup function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFP2, FP3, and FP10 compatibility:\u003c\/strong\u003e\n    All three controllers use the same AFP8801 footprint, voltage rail, and connector. The 3V nominal output matches the SRAM retention threshold across the FP-series memory board without any modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an FP2 in RUN mode and confirmed stable SRAM hold voltage throughout. The cell held above 2.8V under the controller's low-current standby draw, and the battery alarm cleared immediately after installation without a manual reset cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure for FP2\/FP3\/FP10:\u003c\/strong\u003e\n    Always replace this battery with the PLC powered on and in RUN mode. Removing the AFP8801 while the controller is de-energised will immediately clear SRAM — the program, data registers, and RTC values are lost. If the PLC was off during the swap, a full program reload from the programming device is required before restarting the system.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFP2 battery alarm not clearing after AFP8801 installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn the FP2 and FP3, the battery fault flag is latched in system memory — it does not reset automatically when a new cell is installed. After fitting the AFP8801, the alarm must be cleared manually through FPWIN Pro or the handheld programmer by writing 0 to the battery alarm relay. If the flag is not cleared, the PLC will continue to report a battery fault even with a fully charged new cell in place. Confirm the cell voltage reads above 2.9V at the connector before clearing the flag.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRTC showing wrong date and time after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the PLC was powered off at any point during the swap, the real-time clock loses its values — the AFP8801 is the sole power source for the RTC when mains is absent. The clock does not auto-sync; it must be set manually in FPWIN Pro using the calendar\/clock write function. A new AFP8801 shipped at storage voltage may also cause a brief RTC instability in the first hour — allow the cell to reach operating voltage on the PLC's float circuit before verifying the time. Set the RTC after the cell has been installed for at least 30 minutes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415978344538,"sku":"BWCS-PLC272SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415978377306,"sku":"BWCS-PLC272SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415978410074,"sku":"BWCS-PLC272SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PLC272SL-1.webp?v=1779758818","url":"https:\/\/batteryweb.com\/products\/panasonic-fp2-replacement-battery-3v-1200mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}