{"product_id":"coolpad-y75-replacement-battery-38v-2500mah-li-polymer","title":"Coolpad Y75 Replacement Battery CPLD-359 3.8V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCoolpad Y75 Series — 3.8V Li-Polymer Replacement Battery (CPLD-359)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2500mAh lithium-polymer cell that replaces the original CPLD-359 battery in the Coolpad Y75, Y76, Y80D, Y80C, and related models. It slots into the same footprint at 80.00 × 54.41 × 3.92 mm with the same connector orientation. Capacity figures come from product data — 9.5Wh total energy.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eY75 \/ Y76 \/ Y80D \/ Y80C compatibility:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, 3.8V nominal voltage rail, and connector pinout. The BMS handshake protocol is identical across this sub-family, so the cell installs without firmware conflicts or connector adapters.\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 a Y75 unit. The BMS accepted the charge handshake on first connection, held stable voltage across modem-active and screen-on loads, and tripped protection correctly at low-voltage cutoff — no false overcurrent events recorded.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, disable fast charging and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one full reference cycle against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.\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 Coolpad Y75 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Y75 fuel gauge IC stores a discharge curve from the previous cell. When a new cell is installed, the IC applies the old curve to the new cell's voltage profile. At around 20–30% reported charge, the new cell's actual open-circuit voltage drops below the threshold the IC expects at that state-of-charge, and the phone cuts power to protect the SoC. This is a calibration mismatch, not a faulty cell. Run one full discharge to auto-shutdown and one uninterrupted charge to 100% — after that cycle the IC maps the correct curve to the new cell and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-polymer cells self-discharge in storage. If the CPLD-359 cell dropped below approximately 2.5V per cell before installation, the BMS enters lockout mode to prevent damage and blocks normal charge current. The phone shows nothing on screen — no charging animation, no LED. Connect the phone to a wall adapter rated at 5V\/1A or higher and leave it for 20–30 minutes without pressing the power button. The charge IC delivers a trickle pre-charge current that slowly brings the cell voltage back above the BMS recovery threshold, after which normal charging resumes and the phone powers on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404158664794,"sku":"BWCS-CPY750SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404158697562,"sku":"BWCS-CPY750SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404158730330,"sku":"BWCS-CPY750SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPY750SL-1.webp?v=1779369252","url":"https:\/\/batteryweb.com\/products\/coolpad-y75-replacement-battery-38v-2500mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}