{"product_id":"t-mobile-mytouch-3g-replacement-battery-37v-2680mah-li-ion","title":"T-Mobile MyTouch 3G Replacement Battery 35H00119-00M 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile MyTouch 3G \/ G1 Touch — 3.7V Li-ion 2680mAh Replacement Battery (35H00119-00M)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion battery rated at 2680mAh (9.92Wh), replacing OEM part 35H00119-00M. It fits the T-Mobile MyTouch 3G and G1 Touch smartphones. Swap it when the original cell no longer holds a useful charge through a normal day of calls, messaging, and app use.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMyTouch 3G and G1 Touch compatibility:\u003c\/strong\u003e\n    Both devices share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS handshake on each accepts the same cell chemistry, so one part number covers both platforms 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 a MyTouch 3G unit. The BMS accepted the cell without fault flags, charge current ramped correctly through CC\/CV phases, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this battery, run one complete discharge-charge cycle with fast charging disabled. The MyTouch 3G fuel gauge IC was calibrated against the original cell's discharge curve. A full slow cycle lets it map the new cell before the OS reports percentage data you can trust.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MyTouch 3G reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC in the MyTouch 3G tracks charge state using a coulomb counter trained on the original cell's internal resistance and discharge curve. A new cell has different impedance characteristics, so the counter starts working from a mismatched baseline. Until it completes at least one full discharge-to-cutoff followed by a full charge cycle, the reported percentage can be off by 10–20%. This is not a fault with the replacement cell — it resolves after one complete calibration cycle at low current.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or display draws a high current spike and the cell voltage sags below the BMS cutoff threshold — even though the fuel gauge still reads 20–30%. It is a voltage cliff caused by the fuel gauge IC using stale impedance data from the old cell. The new cell has lower internal resistance, but the IC hasn't mapped that yet. Run one full slow discharge until the phone powers off naturally, then charge to 100% — the cliff disappears once the coulomb counter recalibrates to the new discharge curve.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405136003162,"sku":"BWCS-HDE180XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405136035930,"sku":"BWCS-HDE180XL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405136068698,"sku":"BWCS-HDE180XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"url":"https:\/\/batteryweb.com\/products\/t-mobile-mytouch-3g-replacement-battery-37v-2680mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}