{"product_id":"stanley-fmc625d2-replacement-battery-18v-4000mah-li-ion","title":"Stanley 18V FMC687L Replacement Battery 4000mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eStanley FMC625D2 \/ FMC645D2 Series — 18V Li-ion 4000mAh Replacement Battery (FMC687L)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 18V Li-ion replacement battery rated at 4000mAh (72Wh), built to the FMC687L specification. It fits a broad range of Stanley 18V cordless tools including the FMC625D2, FMC645D2, FMC675B, and FMC675B-XE, plus twelve additional models in that platform. The connector and BMS handshake match the original pack, so the charger and tool recognise it without modification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFMC625D2 \/ FMC645D2 platform compatibility:\u003c\/strong\u003e\n    These models share the same 18V rail, slide-in connector block, and BMS communication protocol. One pack works across drills, impact drivers, and saws in this series without adapter or re-pairing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through motor-start inrush cycles on a drill and a circular saw. The BMS held through the trigger-pull voltage spike both times and did not trip the overcurrent threshold under normal load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBreak-in procedure for this platform:\u003c\/strong\u003e\n    On first use, run the tool at half load for two cycles before any maximum-torque application. This allows the BMS to profile inrush current draw and set accurate overcurrent thresholds before you push the motor hard.\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 with the FMC625D2\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger hard from a dead stop, the motor draws a spike of current that can be three to four times the running draw. On a new or recently stored pack, the BMS may not yet have a calibrated overcurrent threshold for that motor, so it cuts the circuit as a precaution. This is not a faulty battery — it is the protection logic responding to an uncalibrated load profile. Two half-load break-in cycles let the BMS log the inrush pattern and widen its threshold to match the motor.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharger blinking red and refusing to accept the pack after storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eStanley's 18V charger has a minimum acceptance voltage — typically around 12V. If a pack sits unused for several months, self-discharge can pull cell voltage below that floor and the charger blinks red instead of beginning a charge cycle. The fix is a brief recovery charge using a compatible charger that supports a wake-up or trickle mode, which nudges the cells back above 12V before the main charge begins. If no trickle mode is available, some users have success connecting the pack for 30-second intervals repeatedly until the charger accepts it. Once cell voltage clears the acceptance threshold, the charger should switch to its normal green charging state.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416040964186,"sku":"BWCS-PTC681PX-1","price":91.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416040996954,"sku":"BWCS-PTC681PX-2","price":107.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416041029722,"sku":"BWCS-PTC681PX-3","price":118.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PTC681PX-1.webp?v=1779759709","url":"https:\/\/batteryweb.com\/products\/stanley-fmc625d2-replacement-battery-18v-4000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}