{"product_id":"noyes-w2003m-replacement-battery-144v-3400mah-li-ion","title":"Noyes W2003M 14.4V Replacement Battery 3900-05-001","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNoyes W2003M — 14.4V Li-ion Replacement Battery (3900-05-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V 3400mAh lithium-ion battery for the Noyes W2003M optical loss test set. It replaces OEM part number 3900-05-001. The W2003M is a portable fiber optic test instrument used for cable testing and network installation verification in the field.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eW2003M platform fit:\u003c\/strong\u003e\n    The W2003M uses a 14.4V rail with a BMS handshake that monitors cell voltage and current draw. This pack matches the OEM connector pinout and communicates correctly with the instrument's power management — the device boots and reads battery state without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the W2003M's full power-on sequence, including probe initialisation and active optical measurement mode. The BMS held steady through the inrush current at startup and did not trip during sustained sensor load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the instrument menu before heading to a job site. The W2003M maps battery state during calibration — skip this step and the low-battery indicator will trigger early on the first measurement session, even with a full charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the W2003M sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge over time. If the W2003M sat in a bag for several months, the pack voltage may have dropped below the BMS recovery threshold — typically around 10–11V for a 14.4V 4-cell pack. At that point the BMS opens the protection circuit and the instrument will not power on or accept a charge. Connect the charger and leave it for 30–60 minutes without touching the device. Most BMS circuits will re-initialise once the charger applies a trickle voltage and the cells recover above the wake threshold.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOptical measurements resetting or dropping out mid-session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf readings reset or the display cuts out briefly during an active test — especially when the instrument is logging a sustained measurement — the cause is usually a voltage dropout under continuous sensor load, not a faulty instrument. The W2003M draws higher current during active optical signal processing than in standby, and a degraded or partially discharged cell cannot hold the voltage rail steady under that load. Check the battery indicator before starting a session — if it shows below 40%, recharge before fieldwork. A mid-session dropout from a new pack points to a connection issue; reseat the battery and verify the contacts are clean before the next run.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360674054234,"sku":"BWCS-NYW200XL-1","price":52.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360674087002,"sku":"BWCS-NYW200XL-2","price":61.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360674119770,"sku":"BWCS-NYW200XL-3","price":68.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NYW200XL-1.webp?v=1778616161","url":"https:\/\/batteryweb.com\/products\/noyes-w2003m-replacement-battery-144v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}