{"product_id":"hemisphere-s320-replacement-battery-74v-2600mah-li-ion","title":"Hemisphere S320 GNSS Replacement Battery 7.4V 2600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHemisphere S320 GNSS Receiver — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.4V 2600mAh (19.24Wh) Li-ion battery replaces the factory pack in the Hemisphere S320 GNSS receiver. The S320 is a field-deployed geodetic instrument used for surveying and construction positioning. Slot this pack in when the original no longer holds a charge through a full field session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS320 platform fit:\u003c\/strong\u003e\n    The S320 and S320 GNSS share the same battery bay, connector pinout, and BMS communication protocol — one pack covers both variants. The voltage rail matches the internal regulator that powers the satellite tracking board and GNSS engine simultaneously.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through cold-start power-on, satellite acquisition, and sustained logging under full antenna load. The BMS held communication with the instrument throughout and did not trip on the current draw at initialisation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the S320 instrument menu before heading to site. The receiver maps battery state during that cycle — skipping it causes premature low-battery warnings during your first measurement session even when the pack is near 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 S320 sat unused in a case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge slowly in storage. If the S320 sat in a carry case for several months, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell. At that point the BMS latches off as a protection measure and the instrument will not power on even when placed on charge. A brief connection to a bench charger capable of forcing a low-current pre-charge pulse can bring the cell voltage back above the recovery threshold, after which normal charging resumes. Target a cell voltage above 3.0V per cell before switching to the standard charge rate.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eS320 readings reset or log entries drop mid-session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when sustained GNSS engine load pulls the pack voltage low enough to cause a momentary dropout on the instrument's internal power rail. The processor resets but the antenna module stays live, so the session appears to continue while the logged data has a gap. It is not a firmware issue — it is a voltage sag caused by a degraded or deeply cycled cell that can no longer hold voltage under load. Check the pack under load with a multimeter: a healthy 7.4V pack should hold above 7.0V with the receiver actively tracking satellites. Replace the pack if voltage sags below that threshold during acquisition.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360792772698,"sku":"BWCS-LI1XL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360792805466,"sku":"BWCS-LI1XL-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360792838234,"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\/hemisphere-s320-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}