{"product_id":"navcom-passy-replacement-battery-74v-2600mah-li-ion","title":"Navcom PASSY 7.4V Li-ion Replacement Battery 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNavcom PASSY \/ RT-3010S \/ SF-3040 \/ Ultra RTK — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 2600mAh Li-ion battery replaces the original pack in the Navcom PASSY, RT-3010S, SF-3040, and Ultra RTK GNSS receivers. These are professional surveying instruments used for satellite-based positioning and field data collection. The cell pack measures 70.40 × 38.70 × 20.50mm and delivers 19.24Wh capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePASSY, RT-3010S, SF-3040, and Ultra RTK compatibility:\u003c\/strong\u003e\n    All four models share the same 7.4V battery bay geometry and voltage rail requirements. The connector pinout and BMS communication protocol are consistent across this instrument family, so one pack covers the full group.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through full charge cycles and monitored BMS handshake behaviour during satellite acquisition and active logging. The BMS held stable through the current spike that occurs when the GNSS module initialises on power-up.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this battery, run a full calibration cycle from the instrument's system menu before going into the field. The receiver maps battery state during calibration. Skipping this step causes the low-battery warning to fire early 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 PASSY sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge over storage. If the pack drops below approximately 2.5V per cell — around 5.0V total — the BMS enters a protection state and will not respond to a normal charge cycle. The charger sees no load and stops immediately. To recover, apply a low-current trickle charge at 0.1C using a compatible Li-ion charger until the pack rises above 6.0V, then continue with a standard charge cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReceiver shuts down mid-logging session with no low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained GNSS processing load pulls enough current to drag cell voltage below the BMS cutoff threshold — even if the display showed a healthy charge percentage moments before. The state-of-charge indicator on these receivers reads a voltage snapshot at startup, not a continuous measurement, so it can misrepresent available capacity under load. Charge the pack fully, then run the calibration cycle through the system menu before the next session. This recalibrates the threshold the instrument uses to trigger the warning.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360794411098,"sku":"BWCS-LI1XL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360794443866,"sku":"BWCS-LI1XL-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360794476634,"sku":"BWCS-LI1XL-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LI1XL-1.webp?v=1778616260","url":"https:\/\/batteryweb.com\/products\/navcom-passy-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}