{"product_id":"ferrex-r800-easy-replacement-battery-28v-5000mah-li-ion","title":"Ferrex R800 EASY+ 28V 5000mAh Compatible Battery 862617","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFerrex R800 EASY+ \/ R800 EASY — 28V Li-ion Replacement Battery (862617)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 28V 5000mAh (140Wh) Li-ion battery fits the Ferrex R800 EASY+ and R800 EASY cordless lawn mowers. It replaces OEM part numbers 862617 and 862618. The cell chemistry, voltage rail, and BMS handshake match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eR800 EASY+ and R800 EASY compatibility:\u003c\/strong\u003e\n    Both mower variants share the same 28V battery platform, connector pinout, and BMS communication protocol. One replacement pack covers either unit without any adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through blade-motor start loads and sustained cutting draws. The BMS held stable across repeated inrush events and balanced all cells correctly before the final charge termination.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eSpring start-up tip:\u003c\/strong\u003e\n    Before first use of the season, bring the battery indoors overnight if temperatures are below 10°C. Cold Li-ion cells have higher internal resistance, and the blade motor's inrush current can trip the BMS on a cold pack before cutting even starts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff on thick-grass or wet-grass blade load\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe R800's blade motor draws a sharp inrush current every time it bites into dense or wet grass. If the pack's cells are even slightly fatigued or below 20% charge, that spike can push current draw past the BMS protection threshold. The BMS responds by cutting output instantly — the mower stops mid-row. Let the pack rest for five minutes, then restart at a slower walking pace to reduce per-cycle load on the motor.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharger not accepting the pack after winter storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA pack left in the garage over winter can self-discharge below the charger's acceptance voltage — typically below 20V on a 28V Li-ion pack. The charger sees an out-of-range cell stack and refuses to start a charge cycle. Some chargers show a fault light rather than a charge-progress light. Try leaving the pack connected for 30 minutes anyway — many chargers run a low-current recovery pulse below the normal acceptance threshold before switching to full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381296988250,"sku":"BWCS-YFA800PW-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381297021018,"sku":"BWCS-YFA800PW-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381297053786,"sku":"BWCS-YFA800PW-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-YFA800PW-1.webp?v=1778899964","url":"https:\/\/batteryweb.com\/products\/ferrex-r800-easy-replacement-battery-28v-5000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}