{"product_id":"zycast-sg-278-replacement-battery-37v-1200mah-li-ion","title":"Zycast SG-278 GPS Navigator Replacement Battery 3.7V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZycast SG-278 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1200mAh Li-ion cell is a direct replacement for the Zycast SG-278 portable GPS navigator. It fits the SG-278 specifically — confirm your model before ordering. Capacity figure comes from product data, not estimated from third-party sources.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSG-278 fit:\u003c\/strong\u003e\n    The SG-278 runs a single-cell 3.7V Li-ion architecture. This replacement matches that voltage rail and the physical footprint — 53.20 × 35.30 × 7.10mm — so the cell seats correctly in the battery bay without forcing the cover.\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 the bench. The BMS held cutoff correctly at low voltage and accepted a standard CC\/CV charge profile without triggering protection flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eCold-start tip after fitting:\u003c\/strong\u003e\n    After installing this cell, take the SG-278 outdoors with a clear sky view and power it on before driving anywhere. GPS units perform a full cold start after a complete power interruption — first satellite acquisition can take 5–10 minutes. Subsequent locks are much faster once almanac data is refreshed.\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 when battery level drops below 20%\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSome GPS navigators, including compact single-cell units like the SG-278, reduce RF receiver sensitivity as battery voltage sags toward the low-cutoff threshold. The GPS chipset draws less power in this state, but tracking accuracy and satellite count both drop as a result. You may notice position drift or a reduced fix quality icon on screen. Keeping the cell above 3.6V under load avoids this threshold — charge the unit before extended navigation sessions.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSG-278 shuts off without warning instead of showing a low-battery alert\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe battery gauge in the SG-278 reads state of charge by tracking voltage, not a fuel gauge IC. When a new cell is fitted, the device has no calibration baseline and may cut power abruptly before the on-screen indicator reaches one bar. This is a calibration gap, not a fault with the cell. Run two full charge and discharge cycles through normal navigation use — the voltage curve the device learns during those cycles brings the low-battery warning back into step with actual remaining charge. After two cycles, the alert should appear at roughly 3.5V before shutdown.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377744543834,"sku":"BWCS-SG278SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377744576602,"sku":"BWCS-SG278SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377744609370,"sku":"BWCS-SG278SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SG278SL-1.webp?v=1778771938","url":"https:\/\/batteryweb.com\/products\/zycast-sg-278-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}