{"product_id":"trimble-ecl-fyn2hed-00-replacement-battery-37v-5200mah-li-ion","title":"Trimble ECL-FYN2HED-00 Compatible Battery 3.7V 5200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTrimble ECL-FYN2HED-00 Series — 3.7V Li-ion Replacement Battery (890-0084)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 5200mAh (19.24Wh) lithium-ion battery replaces the OEM pack in Trimble survey and positioning instruments, including ECL-FYN2HED-00, ECL-FYN2JAF-00, ECL-FYP2HED-00, and EEL-FYN2HED-00 variants, among 70+ compatible models. It shares the same cell format, connector, and BMS handshake envelope as the original 890-0084 pack. Capacity is drawn from product data — 5200mAh — not estimated from field reports.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model fit across the 890-0084 platform:\u003c\/strong\u003e\n    These Trimble instruments share a common 3.7V power rail, identical physical cell bay dimensions (67.90 × 39.50 × 25.90mm), and the same BMS communication protocol. That shared architecture is why one pack number — 890-0084 — covers such a wide range of survey unit variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through instrument power-on, GNSS initialisation, and active data-logging states. The BMS handled the probe and sensor wake-up current spike without tripping, and held stable voltage under sustained positioning load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration cycle:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during your 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 instrument sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eTrimble survey units left in storage draw a small standby current that can drain a Li-ion pack below the BMS protection threshold — typically around 2.5V per cell. Once the pack voltage drops that low, the BMS locks out charge input as a cell-protection measure. The instrument will show no response when placed on charge, and the charger may indicate a fault. To recover, connect to a compatible charger that supports a low-voltage recovery or \"wake\" mode, which applies a trickle current to bring the cell back above the BMS re-enable threshold before normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings drifting or session data resetting mid-logging\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained sensor load — active GNSS tracking, onboard processing, and data logging running simultaneously — pulls enough current to cause a brief voltage dropout. The instrument's microcontroller interprets the sag as a power fault and resets the active session to protect data integrity. A degraded or partially discharged original pack narrows the headroom between nominal voltage and the dropout threshold. Start each logging session with this pack charged to at least 4.1V, confirmed in the instrument's battery status screen before deployment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360735625306,"sku":"BWCS-TRM300SL-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360735658074,"sku":"BWCS-TRM300SL-2","price":47.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360735690842,"sku":"BWCS-TRM300SL-3","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TRM300SL-1.webp?v=1778616232","url":"https:\/\/batteryweb.com\/products\/trimble-ecl-fyn2hed-00-replacement-battery-37v-5200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}