BLU G91 Pro Compatible Battery 3.85V 4600mAh C496588490P

BLU G91 Pro — 3.85V Li-Polymer Replacement Battery (C496588490P)

This 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.

• G91 Pro and G0530WW fit: 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.
• Bench tested on actual hardware: 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.
• Fuel gauge recalibration on first use: 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.

Why the G91 Pro shuts down suddenly at 20–30% after a cell swap

This 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.

USB-PD fast charge not activating on the first cycle after replacement

On 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.