{"product_id":"bq-aquaris-x5-replacement-battery-385v-2800mah-li-polymer","title":"BQ Aquaris X5 Compatible Battery 3.85V 2800mAh 2900","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBQ Aquaris X5 — 3.85V Li-Polymer Replacement Battery (2900)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 2800mAh (10.78Wh) Li-Polymer cell replaces the original battery in the BQ Aquaris X5 and Aquaris X5 Cyanogen Edition smartphones. It fits the same footprint as the OEM cell — 74.40 × 61.00 × 3.80 mm — and connects to the same flex ribbon on the motherboard. Swap it when the original cell no longer holds a charge or causes unexpected shutdowns.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAquaris X5 and X5 Cyanogen Edition fit:\u003c\/strong\u003e\n    Both variants run the same battery bay dimensions and use the same connector pinout, so one cell covers both. The BMS handshake requirements are identical across the two firmware builds.\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 Aquaris X5 platform and confirmed the BMS accepted the cell without fault codes. The protection circuit responded correctly to over-charge and over-discharge thresholds.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one clean reference cycle against the new cell's discharge curve before high-current charging begins.\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 a freshly installed cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a different internal resistance profile than the aged cell the fuel gauge IC was calibrated to. Under modem radio or display load, the phone draws a short current spike that the voltage drops below the cutoff threshold — even though the reported percentage still shows charge remaining. The IC hasn't yet mapped the new cell's actual voltage cliff. One full discharge-to-shutdown followed by a full uninterrupted charge cycle recalibrates the coulomb counter and moves the cutoff trigger to the correct point on the new cell's curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows wrong percentage — jumping or stuck after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores learned data from the old cell — its capacity curve, internal resistance, and self-discharge rate. A new cell invalidates that stored profile immediately, causing the percentage reading to jump, stick, or drop faster than actual charge consumed. The fix is a full calibration cycle: discharge the phone fully until it powers off on its own, then charge to 100% without interruption. After one complete cycle, percentage reporting should track accurately against the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392102006874,"sku":"BWCS-BQX500SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392102039642,"sku":"BWCS-BQX500SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392102072410,"sku":"BWCS-BQX500SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BQX500SL-1.webp?v=1779143796","url":"https:\/\/batteryweb.com\/products\/bq-aquaris-x5-replacement-battery-385v-2800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}