{"product_id":"wurth-sd-12-replacement-battery-12v-2100mah-ni-mh","title":"Würth SD 12 Replacement Battery 12V 2100mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWurth SD 12 — 12V Ni-MH 2100mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 2100mAh Ni-MH replacement battery for the Wurth SD 12 cordless drill\/driver. It fits both SD 12 and SD12 variants of the tool. Voltage matches the original pack at 12V with a 25.2Wh energy rating.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSD 12 and SD12 platform fit:\u003c\/strong\u003e\n    Both model designations share the same battery housing format, connector pinout, and 12V cell configuration. The pack slots directly into the tool's battery bay without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on the SD 12 platform. The BMS handled motor-start inrush current without tripping and held voltage stable across variable torque loads.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eNi-MH break-in on the SD 12:\u003c\/strong\u003e\n    Run the drill at half load for the first two cycles before applying full torque. Ni-MH cells need a few charge-discharge passes to reach rated capacity — pushing maximum torque from the first use can cause early voltage depression in this chemistry.\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 SD 12 motor-start inrush surge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003ePulling the trigger on a cordless drill spikes current draw sharply before the motor reaches operating speed. On the SD 12, this inrush can exceed the overcurrent threshold on a fresh or cold Ni-MH pack, causing the BMS to cut the circuit before the motor turns. The fix is to apply the trigger gradually on first use rather than full-speed from standstill. After two or three normal cycles, the BMS adjusts its current profiling and the cutout stops.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSD 12 charger not recognising the new pack after storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH packs self-discharge during storage, and if cells drop below approximately 9V, some chargers will refuse to start a charge cycle — the indicator light either stays off or blinks an error pattern. This is a charger acceptance threshold issue, not a dead battery. Place the pack in the charger, wait 15–20 minutes, then remove and reinsert it — some chargers need a trickle-start signal to re-enter charge mode. If that fails, check that the terminal voltage reads at least 9V with a multimeter before assuming the pack is faulty.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416062689370,"sku":"BWCS-ABM215PW-1","price":82.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416062722138,"sku":"BWCS-ABM215PW-2","price":96.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416062754906,"sku":"BWCS-ABM215PW-3","price":107.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ABM215PW-1.webp?v=1779760039","url":"https:\/\/batteryweb.com\/products\/wurth-sd-12-replacement-battery-12v-2100mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}