{"product_id":"k-touch-w70-replacement-battery-37v-1500mah-li-ion","title":"K-Touch W70 Replacement Battery 3.7V 1500mAh TBT9608","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eK-Touch W70 \/ T87 Series — 3.7V Li-ion Replacement Battery (TBT9608)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1500mAh Li-ion cell built to the TBT9608 specification. It fits the K-Touch W70, W70+, T87, T87+, and four additional variants in the same family. All share the same cell footprint, connector, and voltage rail, so one part number covers the full range.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eW70 and T87 family compatibility:\u003c\/strong\u003e\n    These models share a common PCB layout, identical dock connector pinout, and the same 3.7V nominal charge termination voltage. The BMS handshake is consistent across the W70, W70+, T87, and T87+ variants — no firmware or connector adaptation needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the TBT9608 cell through charge and discharge on a W70 unit. The BMS accepted charge without fault codes, terminated correctly at 4.2V, and the protection circuit tripped as expected on an over-discharge test below 2.75V per cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to near shutdown, then charge uninterrupted to 100% before normal use. The W70's fuel gauge IC is calibrated to the old cell's discharge curve — skipping this step produces inaccurate percentage readings for the first several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the W70 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe W70 uses a coulomb-counting fuel gauge IC that builds its discharge model from previous cell data stored in non-volatile memory. When you swap to a fresh TBT9608 cell, that stored model no longer matches the new cell's actual discharge curve. The gauge reads voltage as a proxy until it accumulates enough cycle data to correct itself. One full discharge and full uninterrupted charge resets the learned curve and brings percentage readings back into alignment.\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 or screen pulls a current spike that the fuel gauge's stored model didn't anticipate for that state of charge. The cell voltage drops momentarily below the BMS cutoff threshold — around 3.0V under load — and the phone shuts off even though the displayed percentage looks safe. It is not a faulty cell. After two or three full discharge-charge cycles, the fuel gauge recalibrates its low-voltage endpoint and the shutdowns stop. If they persist past three cycles, confirm the cell voltage at shutdown is reading above 2.9V with a multimeter probe on the battery terminals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404287606874,"sku":"BWCS-KTW700SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404287639642,"sku":"BWCS-KTW700SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404287672410,"sku":"BWCS-KTW700SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KTW700SL-1.webp?v=1779369643","url":"https:\/\/batteryweb.com\/products\/k-touch-w70-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}