{"product_id":"berner-bacs-12v-replacement-battery-12v-1500mah-ni-mh","title":"Berner BACS 12V Replacement Battery Ni-MH 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBerner BACS 12V — 12V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 1500mAh Ni-MH replacement battery for the Berner BACS 12V cordless tool system. It fits handheld drills, drivers, and screwdrivers in that range. Voltage and capacity match the original pack spec exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBACS 12V tool platform:\u003c\/strong\u003e\n    These tools share a common 12V rail and pack connector across the BACS range. The BMS in each tool reads cell voltage on contact — same handshake, same protection logic across drills, drivers, and screwdrivers in the system.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through load cycling on a 12V drill platform. The BMS handled motor-start inrush without tripping and held voltage above the low-cell cutoff threshold through full discharge cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBreak-in procedure for BACS 12V tools:\u003c\/strong\u003e\n    On first use, run the tool at half load for two cycles before applying maximum torque. This allows the BMS to profile the motor's inrush current draw before locking in its overcurrent protection thresholds — avoids nuisance cutoffs on heavy fastening jobs.\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 motor-start inrush in the BACS 12V system\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger on a drill or driver, the motor draws a spike of current — often three to five times the running draw — in the first few milliseconds. On a new or storage-depleted Ni-MH pack, cell voltage can dip sharply during that spike. If the BMS reads that dip as an undervoltage event, it trips the protection circuit and the tool cuts out instantly. The fix is to let the pack complete one or two partial-load cycles first, which stabilises the internal resistance across the cells and flattens the inrush dip. After those cycles, the BMS sees a healthier voltage curve and stops tripping on trigger pull.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTool bogs under load and loses torque mid-fastening\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis symptom points to voltage sag — the pack voltage drops under sustained draw faster than the motor can compensate. In Ni-MH packs, this is usually caused by elevated contact resistance at the rail terminals or by cell imbalance from repeated shallow cycling. Check the battery contacts on both the pack and the tool for oxidation or debris — clean with isopropyl alcohol and a dry cloth. If the pack rests above 12.5V off load but sags below 10V under drill load, the cells have degraded and the pack needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416086184026,"sku":"BWCS-BS3300PW-1","price":79.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416086216794,"sku":"BWCS-BS3300PW-2","price":92.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416086249562,"sku":"BWCS-BS3300PW-3","price":102.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BS3300PW-1.webp?v=1779760223","url":"https:\/\/batteryweb.com\/products\/berner-bacs-12v-replacement-battery-12v-1500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}