{"product_id":"k-touch-s5-replacement-battery-37v-1800mah-li-ion","title":"K-Touch S5 Replacement Battery TBT9701 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eK-Touch S5 \/ T810 Series — 3.7V Li-ion Replacement Battery (TBT9701)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1800mAh Li-ion cell replacing the original TBT9701 \/ TBW9701 battery in K-Touch smartphones. It fits the S5, S5T, T810, and E88, along with six additional K-Touch handsets that share the same battery bay dimensions and connector. Physical size is 72.00 × 56.90 × 4.50mm — verify against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eS5 \/ T810 series fit:\u003c\/strong\u003e\n    These models share a common battery footprint, connector pinout, and BMS handshake protocol across the range. One replacement cell covers all listed variants without adapter or modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on K-Touch hardware. The BMS accepted charge from the device's charge IC without tripping overcurrent or overvoltage cutoff, and the cell voltage held stable across a full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging pushes current into an uncalibrated state. Skip this step and percentage readings will drift.\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 replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens because the fuel gauge IC is still running the discharge curve from the old, degraded cell. The new cell has a steeper voltage drop under modem and screen load than the old cell did, so the phone hits a voltage floor the IC doesn't recognise as low — until the hardware forces a cutoff. The fix is one full discharge-to-shutdown followed by a full charge with fast charging off. After that cycle, the coulomb counter recalibrates to the new cell's actual curve and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that drop below roughly 2.5V trigger a BMS lockout — the protection circuit opens and blocks current flow entirely. A standard wall charger may not push enough trickle current through the BMS to recover the cell. Connect the phone to a USB power source that delivers a consistent 5V\/500mA, leave it connected for 20–30 minutes without pressing the power button, then attempt a cold boot. If the BMS re-initialises, the charge IC will take over and bring the cell up to normal voltage from there.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392099909722,"sku":"BWCS-KTW950SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392099942490,"sku":"BWCS-KTW950SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392099975258,"sku":"BWCS-KTW950SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KTW950SL-1.webp?v=1779143748","url":"https:\/\/batteryweb.com\/products\/k-touch-s5-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}