{"product_id":"3-7v-550mah-lipo-upgrade-battery-spare-pack-for-fx9503-f6f-hellcat-rc-airplane","title":"3.7V 550mAh LiPo Upgrade Battery Spare Pack for FX9503 F6F Hellcat RC Airplane","description":"\u003ch1\u003e3.7V 550mAh LiPo Upgrade Battery Spare Pack for FX9503 F6F Hellcat RC Airplane\u003c\/h1\u003e\n\u003chr\u003e\n\u003ch2\u003eEnd Mid-Air Voltage Drops, Recover Instant Stunt Burst Power, and Extend Your Warbird Flight Window\u003c\/h2\u003e\n\u003cp\u003eWhen piloting a high-performance warbird like the brushless FX9503 F6F Hellcat, executing high-load maneuvers like 360° extreme stunts, vertical climbs, and inverted loops demands sustained, aggressive current delivery. Over consecutive charging cycles, standard stock cells suffer from internal chemical degradation, resulting in premature voltage sagging that triggers the low-voltage cutoff midway through an aerial run, or dropping cell punch entirely when you open the throttle for a stunt. For this brushless scale model, an underpowered or swollen cell limits the high-RPM output of the motor, causing sluggish aerodynamic response and risky stalls. Swapping in this premium factory-spec 3.7V 550mAh 25C lithium pack eliminates battery fade, stabilizes delivery throughout your flight window, and delivers the instantaneous high-discharge burst needed to pull off flawless aerobatic loops with confidence.  \u003cstrong\u003eShips worldwide.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHigh-Rate 25C Continuous Discharge Matrix:\u003c\/b\u003e Specially formulated to deliver a steady 3.7V flow with a 25C peak burst output, maintaining continuous throttle response even during sudden high-amp stunt maneuvers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eOptimized Size-to-Capacity Footprint:\u003c\/b\u003e Packed with a dense 550mAh \/ 2.04Wh payload into an exact form-fitting shell measuring precisely 42mm in length, 21mm in width, and 8mm in thickness to maintain the plane's center of gravity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003ePre-Assembled Low-Resistance Pin Harness:\u003c\/b\u003e Comes fitted with a flexible dual-insulated wire run leading to a standard white micro plug connector for a direct, drop-in link to your plane's main board tray.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eRobust Thermal-Shielded Cell Wrapping:\u003c\/b\u003e Encased in a durable, heat-resistant silver protective foil matrix designed to regulate heat build-up during fast charging and intensive aerobatic discharge cycles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eFor the F\u003cstrong\u003eX9503 F6F Hellcat RC Airplane\u003c\/strong\u003e only.\u003cbr\u003eFull model page (specs \u0026amp; photos):\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.kidstoylover.com\/products\/fx9503-f6f-hellcat-rc-airplane-brushless-360-stunt-epp?utm_source=copyToPasteBoard\u0026amp;utm_medium=product-links\u0026amp;utm_content=web\"\u003e\u003cspan\u003ehttps:\/\/www.kidstoylover.com\/products\/fx9503-f6f-hellcat-rc-airplane-brushless\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x  FX9503 3.7V  550mAh Battery\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eInstall Tips\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAccessing and Seating the Fuel Module:\u003c\/b\u003e Unlatch the underbelly battery compartment door on your EPP foam fuselage skin; slide the old drained cell out from the inner cavity slot, checking that the foam interior walls remain clear of debris.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eConnector Orientation and Channel Protection:\u003c\/b\u003e Align the white plastic terminal block connector with the matching socket receiver prong on the ESC wire; push gently until it clicks flush, routing the flexible red and black lead wires cleanly into the side channel path so they do not pinch when shutting the hatch cover.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCenter of Gravity and Hatch Locking:\u003c\/b\u003e Push the 42mm long cell body completely forward into its structural seating pocket to ensure the nose-heavy balance point aligns with factory tracking parameters; click the hatch lock button shut to prevent the power block from shifting during inverted stunts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSafe Handling and Multi-Pack Balance Care:\u003c\/b\u003e Always allow the high-output core cell to cool down for 10-15 minutes after landing before attaching it to your USB charging station adapter; if storing the warbird for more than 7 days, discharge or charge the unit to a stable nominal range to maintain the chemical health of the core lithium layers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eSupport \u0026amp; Warranty\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-month warranty\u003c\/strong\u003e on manufacturing defects\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShips worldwide\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Kidstoylover","offers":[{"title":"Default Title","offer_id":43441445240899,"sku":null,"price":125.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/8313\/1203\/files\/vrghyilehelper.jpg?v=1782126076","url":"https:\/\/www.kidstoylover.com\/ms-hk\/products\/3-7v-550mah-lipo-upgrade-battery-spare-pack-for-fx9503-f6f-hellcat-rc-airplane","provider":"Kidstoylover","version":"1.0","type":"link"}