{"product_id":"blu-g91-pro-replacement-battery-385v-4600mah-li-polymer","title":"BLU G91 Pro Compatible Battery 3.85V 4600mAh C496588490P","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU G91 Pro — 3.85V Li-Polymer Replacement Battery (C496588490P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 4600mAh Li-Polymer battery replaces the original C496588490P cell in the BLU G91 Pro and G0530WW smartphones. It slots into the same footprint — 88.60 x 64.50 x 4.62mm — and connects to the same charge IC and fuel gauge logic already on the board. Capacity figures come directly from our product data, not estimated web specs.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eG91 Pro and G0530WW fit:\u003c\/strong\u003e\n    Both models run the same power rail, connector pinout, and BMS handshake tied to the C496588490P cell. Swapping between these variants needs no adapter or firmware change — the charge IC recognises the same cell chemistry and impedance profile.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on a G91 Pro unit, monitoring the BMS cutoff at the low-voltage threshold and confirming the charge IC accepted the cell without triggering a fault flag on the first cycle.\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 fast charging pushes current into an uncalibrated coulomb counter — skipping this step is the main cause of erratic percentage readings after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the G91 Pro shuts down suddenly at 20–30% after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under modem or display load — actual cell voltage drops below the cutoff threshold even though the reported percentage still reads 25% or higher. The OS sees a hard undervoltage event and cuts power before the display can warn you. One full discharge-charge cycle with fast charging disabled forces the coulomb counter to relearn the new cell's curve and corrects the mismatch.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eOn a freshly installed Li-Polymer cell with no charge history, the BMS may present a higher-than-normal impedance to the charge IC. Some USB-PD controllers interpret this as a fault condition and fall back to standard 5V charging rather than negotiating the higher voltage contract. This is not a defective battery — it resolves after the first full charge cycle normalises the cell's internal resistance. If fast charge still does not activate after two full cycles, check that the USB-PD cable and adapter both support the G91 Pro's required voltage tier, not just 5V output.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391879446618,"sku":"BWCS-BLG910SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391879479386,"sku":"BWCS-BLG910SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391879512154,"sku":"BWCS-BLG910SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLG910SL-1.webp?v=1779142479","url":"https:\/\/batteryweb.com\/products\/blu-g91-pro-replacement-battery-385v-4600mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}