{"product_id":"lenovo-k800-replacement-battery-37v-1900mah-li-ion","title":"Lenovo K800 Replacement Battery BL189 3.7V 1900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo K800 — 3.7V Li-ion Replacement Battery (BL189)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BL189 is a 3.7V Li-ion cell rated at 1900mAh (7.03Wh), built to replace the original battery in the Lenovo K800 smartphone. The K800 is an Intel Atom-powered Android device from the early 2010s that uses a removable battery. When the original cell degrades and can no longer hold voltage under screen or modem load, this replacement restores full device function.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK800 fit confirmed:\u003c\/strong\u003e\n    The BL189 connector, physical footprint (51.90 × 51.00 × 6.00mm), and voltage rail match the K800 battery bay exactly. No adapters or modifications required — the BMS handshake negotiates with the K800's charge IC as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the K800 platform. The BMS held charge cutoff at the correct upper voltage threshold and did not trip under normal screen-on and modem-active load conditions.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, run one full discharge down to auto-shutdown, then charge uninterrupted to 100% before using the device again. The K800's coulomb counter is calibrated to the old cell — skipping this step causes the percentage readout to drift or report inaccurate levels from day one.\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 BL189 replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe K800 shuts down mid-use because the phone's fuel gauge IC is still referencing the discharge curve of the worn original cell. When the new cell hits a voltage point the old curve mapped to 20–30%, the system triggers an emergency cutoff — even though real capacity remains. The fix is a full discharge-charge calibration cycle immediately after installation. After one complete cycle, the coulomb counter resets its reference and the percentage readout stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice not powering on after the BL189 sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that sit uncharged for extended periods can drop below 2.5V per cell, which triggers BMS lockout — the pack refuses to accept a charge or power the device as a protection measure. Connect the K800 to a wall charger and leave it undisturbed for 15–20 minutes before attempting to power on. Most BMS circuits will accept a trickle pre-charge at this stage and begin recovery. If the charge LED does not activate within 30 minutes, check that the charger output is at least 5V 1A.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404316901466,"sku":"BWCS-LVK800SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404316934234,"sku":"BWCS-LVK800SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404316967002,"sku":"BWCS-LVK800SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVK800SL-1.webp?v=1779369680","url":"https:\/\/batteryweb.com\/products\/lenovo-k800-replacement-battery-37v-1900mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}