{"product_id":"sony-nv-u53g-replacement-battery-37v-800mah-li-ion","title":"Sony NV-U53G GPS Navigator Replacement Battery 3.7V 800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony NV-U53G \/ NV-U82 Series — 3.7V Li-ion Replacement Battery (3-281-790-02)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 800mAh Li-ion cell that replaces part number 3-281-790-02 in Sony's NV-U portable GPS navigator range. It fits the NV-U53G, NV-U73T, NV-U82, NV-U83, and three additional models in the same series. Dimensions are 35.41 × 32.59 × 8.25mm — measure your original before fitting if you are unsure which variant you have.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNV-U53G \/ NV-U82 series compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one cell covers the full lineup without modification.\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 NV-U82 platform. The onboard BMS accepted the cell without fault codes, and charge termination fired correctly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst satellite fix after fitting:\u003c\/strong\u003e\n    After any full power interruption the GPS module loses its ephemeris data and performs a cold start. Power the unit on outdoors with a clear sky view and leave it for 5–10 minutes before driving — subsequent warm starts will lock in under a minute.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS accuracy dropping as battery level falls\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eSome Sony NV-U units reduce RF receiver sensitivity at low battery to cut current draw. This shows up as position drift or the blue dot jumping between streets even on a familiar route. It is not a GPS signal problem — it is a power management response. Keep the battery above 20% on long drives, or plug into car power via the vehicle adapter to hold the receiver at full sensitivity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUnit shuts off without a low-battery warning\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a battery swap the fuel gauge IC has no charge history to reference, so its voltage-to-capacity curve is uncalibrated. The unit reads remaining charge as higher than it actually is until the cell has been through at least one full cycle. Run the battery from a full charge down to automatic shut-off, then charge uninterrupted to 100% — after that cycle the warning threshold aligns with the actual cutoff voltage near 3.0V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377632247898,"sku":"BWCS-SUN82SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377632280666,"sku":"BWCS-SUN82SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377632313434,"sku":"BWCS-SUN82SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SUN82SL-1.webp?v=1778771783","url":"https:\/\/batteryweb.com\/products\/sony-nv-u53g-replacement-battery-37v-800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}