{"product_id":"skygolf-skycaddie-sx400-replacement-battery-38v-3750mah-li-polymer","title":"SkyGolf SkyCaddie SX400 Compatible Battery 3.8V 3750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSkyGolf SkyCaddie SX400 — 3.8V Li-Polymer Replacement Battery (U744379PV)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V 3750mAh Li-Polymer cell replaces part number U744379PV in the SkyGolf SkyCaddie SX400 handheld golf GPS. The SX400 displays yardages, hazard distances, and course maps during a round. Swapping this cell restores full function when the original no longer holds a charge through 18 holes.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSkyCaddie SX400 fit:\u003c\/strong\u003e\n    The SX400 uses a single-cell Li-Polymer pack at 3.8V nominal with a proprietary connector and BMS handshake tied to the unit's power management IC. This replacement matches that voltage rail and connector pinout exactly — the BMS communicates correctly on power-up without triggering a fault state.\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 SX400 platform. The BMS accepted the cell, reported state-of-charge accurately across the charge curve, and did not trip the low-voltage cutoff prematurely during GPS-active discharge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-power tip after fitting:\u003c\/strong\u003e\n    After fitting this cell, power the SX400 on outdoors and let it acquire a satellite fix before heading out. The unit performs a cold start after any full power interruption — first fix can take 5–10 minutes outdoors. Subsequent warm starts are under a minute once almanac data 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 SX400\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SX400 scales back receiver sensitivity when cell voltage drops below a set threshold to reduce current draw and extend screen-on time. At reduced sensitivity, the unit may show a weaker satellite signal, causing yardage readings to jitter or update slowly. This is a firmware-level power decision, not a GPS hardware fault. Keeping the cell above 3.5V under load prevents the receiver from stepping down.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSX400 shuts off without warning before the low-battery indicator appears\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap, the SX400's fuel gauge needs a full charge-to-discharge cycle to recalibrate its voltage-to-capacity mapping. Until that cycle completes, the unit's state-of-charge estimate runs ahead of actual cell voltage — the display still shows one bar when the cell voltage has already hit the cutoff threshold. The fix is one full charge from flat to 100% without interruption. After that conditioning cycle, the low-battery warning and shutoff threshold realign correctly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377566679130,"sku":"BWCS-SGX400SL-1","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377566711898,"sku":"BWCS-SGX400SL-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377566744666,"sku":"BWCS-SGX400SL-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SGX400SL-1.webp?v=1778771669","url":"https:\/\/batteryweb.com\/products\/skygolf-skycaddie-sx400-replacement-battery-38v-3750mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}