{"product_id":"nemerix-bt77-bluetooth-gps-receiver-replacement-battery-37v-1000mah-li-ion","title":"Nemerix BT77 Bluetooth GPS Replacement Battery HXE-W01 3.7V 1000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNemerix BT77 Bluetooth GPS Receiver — 3.7V Li-ion Replacement Battery (HXE-W01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1000mAh Li-ion cell replacing the HXE-W01 in the Nemerix BT77 Bluetooth GPS Receiver. The BT77 is a compact portable GPS unit that streams location data over Bluetooth to a connected device. It runs on a single flat Li-ion cell housed behind the rear cover.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBT77 platform fit:\u003c\/strong\u003e\n    The BT77 uses a 3.7V single-cell architecture with a compact 52.96 x 33.64 x 5.15mm footprint. This cell matches that envelope and the connector orientation used on the original HXE-W01. The onboard BMS handles charge cutoff and over-discharge protection without requiring any handshake with the host device.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a GPS receiver load profile — low continuous draw with periodic Bluetooth transmission bursts. The BMS held stable voltage across the full discharge curve with no unexpected cutoffs at the transmission peaks.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start behaviour after fitting:\u003c\/strong\u003e\n    After fitting this cell and powering on, take the BT77 outdoors immediately and leave it running. A full power interruption clears the GPS receiver's ephemeris data, triggering a cold start. First satellite fix after a cold start takes 5–10 minutes. Subsequent power cycles warm-start in under a minute once the almanac is cached.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy reduced at low battery on the BT77\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eWhen cell voltage drops below approximately 3.5V, some GPS receivers reduce RF front-end sensitivity to conserve power. On the BT77 this can show as wider position scatter or slower fix re-acquisition when moving. The symptom is easy to miss because the unit stays powered and appears to be working normally. A fresh, fully charged cell restores the receiver to full sensitivity immediately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBT77 shutting off without warning before the battery indicator reaches empty\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BT77's battery indicator is calibrated against the original cell's discharge curve. After years of use, a degraded original cell may have a steeper voltage drop at end-of-life than the indicator expects, causing the device to cut power while still showing one bar. This replacement cell restores a standard discharge curve, but the indicator may still lag for the first two full charge-discharge cycles while the device recalibrates its threshold. Run two complete cycles — charge to full, use until shutdown — before trusting the indicator reading.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377709023322,"sku":"BWCS-XEW01SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377709056090,"sku":"BWCS-XEW01SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377709088858,"sku":"BWCS-XEW01SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-XEW01SL-1.webp?v=1778771896","url":"https:\/\/batteryweb.com\/products\/nemerix-bt77-bluetooth-gps-receiver-replacement-battery-37v-1000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}