{"product_id":"gsmart-s1200-replacement-battery-37v-1010mah-li-ion","title":"GSmart S1200 Replacement Battery GPS-H03 3.7V 1010mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGSmart S1200 Series — 3.7V Li-ion Replacement Battery (GPS-H03)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1010mAh Li-ion battery for the GSmart S1200, S1205, and S1208 smartphones. It replaces OEM part GPS-H03 (also cross-referenced as 29S00-060F0-S90S). Swap it in when the original cell no longer holds charge or shuts the phone down unexpectedly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS1200 \/ S1205 \/ S1208 fit:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers the entire S1200 platform 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 full charge and load discharge on the S1200 platform. The BMS accepted the cell without a protection trip, and the charge IC brought it to 4.2V without thermal events.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the S1200 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe S1200's fuel gauge IC retains the discharge curve from the original cell in its coulomb counter. When a new cell is installed, the stored curve no longer matches actual cell voltage under load — especially during modem transmit bursts or screen-on peaks. The phone reads 25% remaining but the cell voltage drops below the BMS cutoff threshold under that sudden current draw. One full discharge cycle from 100% to automatic shutdown, followed by a full charge, resets the coulomb counter to the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone will not power on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage, and the BMS on this cell will enter lockout if voltage drops below approximately 2.5V per cell during extended shelf time. The phone shows nothing — no boot screen, no charging indicator. Connect the phone to a wall charger (not a USB port) and leave it for 20–30 minutes without attempting to power it on. Once the BMS detects sufficient voltage recovery, the charge IC re-engages and the phone will show the charging animation. If no response after 45 minutes, confirm the charger is delivering at least 5V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405125582938,"sku":"BWCS-GS120SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405125615706,"sku":"BWCS-GS120SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405125648474,"sku":"BWCS-GS120SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GS120SL-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/gsmart-s1200-replacement-battery-37v-1010mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}