{"product_id":"samsung-sph-m330-replacement-battery-37v-940mah-li-ion","title":"EB424255VA Samsung SPH-M330 Replacement Battery 3.7V 940mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung SPH-M330 \/ SPH-M350 Series — 3.7V Li-ion Replacement Battery (EB424255VA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 940mAh Li-ion replacement battery for the Samsung SPH-M330, SPH-M340, SPH-M350, and Seek SPH-M350, among other compatible models. It replaces OEM part numbers EB424255VA, EB424255VU, EB424255VABSTD, and EB424255VUCSTD. The cell matches original dimensions at 54.72 × 41.58 × 4.12mm and seats directly in the factory battery bay.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSPH-M330 \/ M340 \/ M350 platform fit:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, voltage rail, and connector pinout. The BMS handshake is consistent across the series, so one cell covers all listed variants 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 discharge on the SPH-M350. The BMS handled charge termination cleanly at 4.2V, and protection cutoff triggered correctly at low-voltage threshold without latching.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use, disable any power-saving modes and run one complete discharge-to-charge cycle at standard current. This lets the phone's fuel gauge IC map the new cell's discharge curve before the OS reports capacity accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SPH-M330 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in the SPH-M330 uses a coulomb counter calibrated to the original cell's discharge curve. When a new cell goes in, the stored curve no longer matches actual cell behaviour. The phone reads voltage and translates it to a percentage using outdated reference data, so the number on screen drifts from reality. One full uninterrupted discharge down to auto-shutoff, followed by a full charge to 4.2V, resets the reference and brings the percentage back in line.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem transmits or the screen backlight spikes current draw, causing cell voltage to sag below the BMS cutoff threshold even though the gauge shows charge remaining. A fresh cell with an uncalibrated fuel gauge IC makes this worse — the OS thinks 25% remains, but cell voltage has already dropped to the 3.0V cutoff zone under load. The fix is the same full recalibration cycle: discharge to auto-shutoff, charge fully. After one cycle, the gauge IC anchors its low-voltage warning to a more accurate state-of-charge point, and premature shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404289933402,"sku":"BWCS-SMT560XL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404289966170,"sku":"BWCS-SMT560XL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404289998938,"sku":"BWCS-SMT560XL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMT560XL-1.webp?v=1779369658","url":"https:\/\/batteryweb.com\/products\/samsung-sph-m330-replacement-battery-37v-940mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}