{"product_id":"coolpad-5315-replacement-battery-37v-2500mah-li-ion","title":"Coolpad 5315 Replacement Battery CPLD-129 3.7V 2500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCoolpad 5315 — 3.7V Li-ion Replacement Battery (CPLD-129)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2500mAh Li-ion cell built to replace the original CPLD-129 battery in the Coolpad 5315 smartphone. It fits the 5315 directly — same connector, same footprint at 80.00 × 65.00 × 4.30mm. Swap it when the original cell no longer holds charge or shuts the phone down unexpectedly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCoolpad 5315 fitment:\u003c\/strong\u003e\n    The 5315 uses a dedicated connector and BMS handshake tied to the CPLD-129 cell spec. This replacement matches the 3.7V nominal rail and pin configuration so the charge IC accepts the cell without flagging an incompatible battery warning.\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 5315 platform. The BMS accepted the cell, charge termination triggered correctly at full voltage, and the coulomb counter tracked state-of-charge without error flags through multiple cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge recalibration:\u003c\/strong\u003e\n    After installing this cell, disable fast charging and run one full discharge-to-charge cycle at standard rate. The fuel gauge IC on the 5315 is calibrated to the old cell's discharge curve — one slow cycle lets it remap against the new cell before high-current charging is applied.\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 5315\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below the modem's minimum operating threshold under load, even though the fuel gauge still reads 20–30%. Aged cells develop high internal impedance — voltage sags sharply when the radio transmits or the screen peaks, tripping the protection circuit before the gauge catches up. A new CPLD-129 cell with lower impedance sustains voltage through those load spikes. After installation, confirm the phone stays on past 15% under a call or screen-on session — that confirms the voltage floor is holding.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows wrong percentage after cell replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the 5315 stores a learned discharge curve from the old cell. After a cell swap, it maps the new cell's voltage against that old curve, so percentage readings jump or read high until the IC relearns. Run one complete discharge — down to auto-shutdown — followed by a full uninterrupted charge at standard rate. That single cycle gives the coulomb counter enough data to reanchor its 0% and 100% endpoints. After that cycle, percentage tracking stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404201558106,"sku":"BWCS-CPD129SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404201590874,"sku":"BWCS-CPD129SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404201623642,"sku":"BWCS-CPD129SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CPD129SL-1.webp?v=1779369289","url":"https:\/\/batteryweb.com\/products\/coolpad-5315-replacement-battery-37v-2500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}