{"product_id":"coolpad-8070d-replacement-battery-37v-1400mah-li-ion","title":"Coolpad 8070D Replacement Battery CPLD-109 3.7V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCoolpad 8070D — 3.7V Li-ion Replacement Battery (CPLD-109)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1400mAh Li-ion cell built to fit the Coolpad 8070D smartphone. It replaces part number CPLD-109 — the original internal battery that powers calling, messaging, and app functions. When the original cell degrades and can no longer hold adequate charge, this replacement restores full device operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoolpad 8070D fit:\u003c\/strong\u003e\n    The 8070D uses a fixed connector pinout and cavity measuring 55.81 × 50.83 × 5.25 mm. This cell matches that footprint and wiring directly. The BMS protection circuit communicates correctly with the phone's charge IC without modification.\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 8070D platform. The BMS held charge termination correctly and did not trip on normal screen or modem loads. Voltage under load stayed within the expected range for a 3.7V nominal cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skipping this step causes erratic percentage readings in the first few days of use.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 8070D reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 8070D uses a fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, the IC is still reading against the old curve. The percentage displayed reflects the old cell's behaviour, not the new cell's actual state of charge. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% resets the coulomb counter and syncs the gauge to the new cell.\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 cell voltage drops sharply under the combined load of the modem radio and display — a voltage cliff the fuel gauge did not predict. The phone shuts down not because the percentage is low, but because instantaneous voltage fell below the protection threshold. Check the resting voltage after shutdown — if it recovers above 3.6V within a few minutes, the cell is intact and the gauge is uncalibrated. Run one full cycle from shutdown to 100% charge to correct it.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404203360346,"sku":"BWCS-CPD109SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404203393114,"sku":"BWCS-CPD109SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404203425882,"sku":"BWCS-CPD109SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPD109SL-1.webp?v=1779369289","url":"https:\/\/batteryweb.com\/products\/coolpad-8070d-replacement-battery-37v-1400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}