{"product_id":"sony-ericsson-t68-replacement-battery-37v-750mah-li-ion","title":"BST-14 Sony Ericsson T68 Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony Ericsson T68 \/ T68i \/ C1002S — 3.7V Li-ion Replacement Battery (BST-14)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion replacement for the BST-14 battery used in the Sony Ericsson T68, T68i, and C1002S. These early-2000s candybar phones share the same battery bay and connector, so one cell covers all three models. Capacity matches the original OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eT68, T68i, and C1002S compatibility:\u003c\/strong\u003e\n    All three models use the same 3.7V rail, identical physical connector, and the same BMS handshake protocol. One BST-14 cell fits all without modification or adapter.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a T68i unit. The BMS accepted charge on first connection, current limiting engaged correctly at top-of-charge, and the protection circuit tripped as expected under a deliberate short-load test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before normal use. The T68's fuel gauge IC was calibrated to your old degraded cell — one full cycle resets the reference curve and prevents erratic percentage readings from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the T68 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe T68 uses a simple coulomb-counting fuel gauge IC that stores a discharge curve based on your old cell's behaviour. When you install a fresh 750mAh cell, the IC is still referencing the degraded curve from the original battery. This causes the phone to report inflated or erratic percentages — typically jumping from 60% to 20% without warning. One full discharge-to-shutdown cycle followed by a complete charge forces the IC to rebuild its reference map against the new cell's actual voltage profile. After that single calibration cycle, percentage reporting stabilises.\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 is a voltage cliff issue, not a capacity problem. Under load — screen backlight, active call, or GSM transmission burst — the cell voltage drops sharply if the fuel gauge IC hasn't yet mapped the new cell's discharge curve. The phone's under-voltage protection trips before the displayed percentage reaches zero. It looks like a dead battery but the cell still holds charge. Perform a full uninterrupted discharge-charge cycle first. If the shutdown persists after calibration, check that resting cell voltage measures at least 3.6V before installation.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409463246938,"sku":"BWCS-ERT68SL-1","price":22.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409463279706,"sku":"BWCS-ERT68SL-2","price":24.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409463312474,"sku":"BWCS-ERT68SL-3","price":27.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ERT68SL-big.webp?v=1779579784","url":"https:\/\/batteryweb.com\/products\/sony-ericsson-t68-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}