{"product_id":"lucky-duck-agitator-hdi-drake-replacement-battery-111v-5200mah-li-ion","title":"Lucky Duck Agitator HDi Replacement Battery 11.1V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLucky Duck Agitator HDi Series — 11.1V Li-ion Replacement Battery (21-11120-8)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V 5200mAh Li-ion replacement battery for the Lucky Duck Agitator HDi Drake, Hen \u0026amp; Goose, and Kennel Fan. It uses OEM part number 21-11120-8 and matches the original voltage and capacity spec. The battery connects directly to the motorized decoy's drive system with no modification needed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAgitator HDi Drake, Hen \u0026amp; Goose, and Kennel Fan compatibility:\u003c\/strong\u003e\n    These three models share the same 11.1V three-cell Li-ion architecture, connector type, and BMS handshake protocol — which is why one part number covers all three. Swapping between units carries no electrical risk if the OEM part number matches.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through full charge and discharge cycles on a matched load. The BMS held cell balance within spec, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no false shutdowns during steady motor draw.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-weather pre-warming:\u003c\/strong\u003e\n    Li-ion cells lose 15–25% usable capacity at 0°C and up to 40% at -20°C. Keep this battery in an inner jacket pocket until just before deploying the decoy. A warm cell put into the unit at the water's edge holds significantly more capacity than one that sat in a cold blind bag all morning.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Agitator HDi slows down or stops mid-session in cold water\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eCold water conducts heat away from the battery housing faster than ambient air. Even if the air temperature is mild, a partially submerged decoy can pull the cell pack below 5°C within minutes. At that temperature, internal resistance rises sharply, and the BMS may interpret the resulting voltage sag as a low-cell event and cut motor power. The fix is simple — keep the battery warm until the last moment before deployment and avoid leaving the decoy stationary in water between sets.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDecoy won't power on after sitting in storage between seasons\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge at roughly 1–3% per month at room temperature. After several months of off-season storage, a partially charged pack can drop below the BMS minimum boot voltage — typically around 9V for an 11.1V three-cell pack — and the protection circuit will block output entirely. Connect the battery to the original charger and leave it for a full charge cycle before assuming it has failed. If the charger light activates and completes the cycle, the pack has recovered; if it shows no response after 30 minutes, cell voltage has likely fallen below the charger's wake threshold at approximately 8.1V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416238489690,"sku":"BWCS-LKD208SL-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416238522458,"sku":"BWCS-LKD208SL-2","price":58.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416238555226,"sku":"BWCS-LKD208SL-3","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKD208SL-1.webp?v=1779761098","url":"https:\/\/batteryweb.com\/products\/lucky-duck-agitator-hdi-drake-replacement-battery-111v-5200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}