{"product_id":"novopress-aco203-replacement-battery-18v-4000mah-li-ion","title":"NovoPress ACO203 18V Replacement Battery 4000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNovoPress ACO203 Series — 18V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 18V 4000mAh (72Wh) Li-ion battery fits the NovoPress ACO203, ACO203-XL, ACO202, and ACO401 cordless power tools. It replaces a degraded or failed original pack without any modification to the tool. Capacity figures are taken directly from the replacement cell specification — 4000mAh at 18V nominal.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eACO203, ACO203-XL, ACO202, ACO401 platform:\u003c\/strong\u003e\n    These four models share the same 18V rail, battery housing dimensions, and connector pinout. The BMS communication protocol is consistent across the range, so one pack services all four without any adapter or firmware difference.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through repeated motor-start inrush events on a NovoPress-compatible 18V platform. The BMS held the overcurrent threshold without nuisance tripping, and cell voltage recovery between trigger pulls stayed within the expected window for a fresh 4000mAh cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBreak-in procedure for motor inrush calibration:\u003c\/strong\u003e\n    On first use, run the tool at half load for two full discharge-and-charge cycles before applying maximum torque. This lets the BMS profile the actual inrush current draw from your specific motor and set its overcurrent protection thresholds accordingly — preventing unnecessary cutoffs during heavy work later.\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 ACO203 motor-start inrush surge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ACO203 draws a short, sharp current spike the instant the trigger is pulled — this inrush can hit three to five times the steady running current. A new or cold battery with a freshly initialised BMS may interpret that spike as a fault and cut power before the motor reaches speed. The BMS stores inrush data over the first few cycles to distinguish a normal start from a genuine short-circuit event. If cutoffs persist past the second cycle, check that the battery contacts are clean and seated fully — high contact resistance amplifies the apparent inrush spike the BMS sees.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTool bogs under load even with a charged pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the ACO203 feels weak or slows under pressure with a battery that reads charged, the likely cause is voltage sag — the cell voltage drops under load faster than the BMS can compensate. This happens when rail contact resistance is elevated or when cells have been shallow-cycled repeatedly, leaving them unable to deliver current at full voltage. Clean the battery terminals and tool contacts with isopropyl alcohol, then run two full discharge cycles to let the BMS recalibrate the state-of-charge curve. If resting voltage after a full charge sits below 20.0V on an 18V nominal pack, the cells are not recovering fully and the pack needs replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416057512026,"sku":"BWCS-MKM180PX-1","price":96.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416057544794,"sku":"BWCS-MKM180PX-2","price":112.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416057577562,"sku":"BWCS-MKM180PX-3","price":125.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MKM180PX-1.webp?v=1779759860","url":"https:\/\/batteryweb.com\/products\/novopress-aco203-replacement-battery-18v-4000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}