{"product_id":"fromm-p318-replacement-battery-18v-4000mah-li-ion","title":"Fromm P318 18V Cordless Drill Replacement Battery 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFromm P318 \/ P326 \/ P327 \/ P328 Series — 18V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 18V 4000mAh (72Wh) Li-ion battery replaces the original pack on Fromm P318, P326, P327, and P328 cordless tools. It matches the voltage rail and connector format of the original, so the tool recognises the pack and the charger accepts it without modification. Capacity figures come directly from the product specification — 4000mAh at 18V nominal.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eP318 \/ P326 \/ P327 \/ P328 platform fit:\u003c\/strong\u003e\n    These four Fromm models share the same 18V battery interface, connector pinout, and BMS handshake protocol. One battery covers the full range — no adapter or firmware change needed.\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 drill platform. The BMS held the overcurrent threshold steady across cold and warm starts without tripping into protection mode under normal trigger use.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBreak-in load protocol:\u003c\/strong\u003e\n    On first use, run the tool at half load for two cycles before applying full torque. This lets the BMS measure the motor's inrush current draw and calibrate its overcurrent protection thresholds before you hit maximum demand.\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 surge during trigger pull\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eCordless drills pull their highest current in the first milliseconds after trigger press — this is motor-start inrush, and it can be three to five times the steady running current. A new pack coming out of storage has resting cells with no inrush profile stored in the BMS. If the BMS overcurrent threshold is set conservatively at factory defaults, a hard trigger pull into a stalled or high-resistance fastener can trip the protection circuit. The fix is to run two half-load break-in cycles so the BMS can log real inrush data before you apply full torque.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTool bogs under load and loses torque mid-fastener\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the drill starts normally but loses power or slows when driving into dense material, the cause is usually voltage sag — the cell voltage drops under sustained current draw faster than the BMS can compensate. This is often worsened by dirty or corroded contact rails on the battery slot, which add resistance to the power path. Clean the battery terminals and tool contacts with isopropyl alcohol, then retest. If sag continues, check resting voltage with a multimeter — a healthy 18V Li-ion pack should read between 19.8V and 20.5V fully charged.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416057708634,"sku":"BWCS-MKM180PX-1","price":96.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416057741402,"sku":"BWCS-MKM180PX-2","price":112.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416057774170,"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\/fromm-p318-replacement-battery-18v-4000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}