{"product_id":"black-decker-kc9039-replacement-battery-36v-2000mah-ni-mh","title":"Black \u0026 Decker 499055-04 Cordless Drill Replacement Battery 3.6V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBlack \u0026amp; Decker KC9039 \/ KC9036 — 3.6V Ni-MH Replacement Battery (499055-04)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 2000mAh Ni-MH battery pack for the Black \u0026amp; Decker KC9039 and KC9036 cordless drill\/drivers. It replaces OEM part numbers 499055-04 and 3HR-4\/5SC. Fits directly into the battery bay of both models with no modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKC9039 and KC9036 compatibility:\u003c\/strong\u003e\n    Both models run the same 3.6V power rail and use an identical battery housing geometry with the same terminal layout. The sub-C Ni-MH cell format and connector match across both platforms, so one part number covers both drills.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a KC9039 drill and monitored cell voltage across three full cycles. The pack accepted charge correctly from the standard Black \u0026amp; Decker charger and held voltage under torque load without mid-cycle dropout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eNi-MH break-in on this drill:\u003c\/strong\u003e\n    On first use, run the drill at half load — light fastening work, not max-torque driving — for the first two cycles. Ni-MH cells at this voltage have a memory-sensitive charge profile, and shallow full-load cycling early on can reduce total usable capacity from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eInrush spike tripping the protection circuit on trigger pull\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger on a cordless drill, the motor draws a short surge of current well above its running draw. On a 3.6V Ni-MH pack, this inrush spike can exceed the overcurrent threshold of the protection circuit if the cells are cold or not yet fully charged. The drill cuts out immediately at trigger pull — not under sustained load, but right at the start. Let the pack warm to room temperature and ensure it is fully charged before heavy use. A full charge brings cell impedance down and allows the pack to deliver the burst current the motor demands at startup.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDrill bogs down and loses torque partway through a fastening job\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the battery voltage sags under sustained motor load — the cells can't maintain rail voltage as current draw climbs, so the drill slows or stalls mid-screw. On Ni-MH packs, this is often caused by high contact resistance at the battery terminals rather than a failing cell. Clean the battery contacts and the drill's terminal bay with a dry cloth or fine abrasive. If the sag continues after cleaning, check resting voltage with a multimeter — a healthy 3.6V Ni-MH pack should read 4.1–4.3V immediately after a full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416006983770,"sku":"BWCS-BKC903PW-1","price":50.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416007016538,"sku":"BWCS-BKC903PW-2","price":59.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416007049306,"sku":"BWCS-BKC903PW-3","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKC903PW-1.webp?v=1779759244","url":"https:\/\/batteryweb.com\/products\/black-decker-kc9039-replacement-battery-36v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}