Radiant MAX 5G Compatible Battery 3.87V 4600mAh

Radiant MAX 5G / Dream 5G — 3.87V Li-Polymer Replacement Battery

This 3.87V, 4600mAh Li-Polymer cell replaces the original battery in the Radiant MAX 5G and Dream 5G smartphones (also listed as EA211001). It restores power to the processor, display, and cellular radio without requiring any firmware changes. Capacity figures come from our product data — 17.8Wh total stored energy.

• MAX 5G and Dream 5G platform fit: Both models share the same battery bay dimensions (84.50 × 65.40 × 5.00mm), connector pinout, and BMS handshake protocol — one cell services either device without modification.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and confirmed the BMS accepted charge current correctly, voltage stepped through the expected Li-Polymer charge curve (CC→CV), and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. This gives the fuel gauge IC time to build an accurate discharge curve against the new cell before high-current charging begins pushing current into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the replacement cell

The fuel gauge IC in the MAX 5G was calibrated to the discharge curve of the original cell. A new cell with a different internal resistance profile will cause the IC to misjudge remaining capacity, triggering a protective shutdown when the reported percentage still looks safe. The modem and display draw a combined load spike that the uncalibrated gauge cannot predict accurately. Run one full discharge to 0% and a full charge to 100% without interruption — this resets the coulomb counter baseline and the shutdowns stop.

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

On the first charge cycle, a new Li-Polymer cell presents higher internal impedance than the depleted original. Some charge ICs on this platform interpret that elevated impedance as a fault condition and fall back to standard 5V/1A charging rather than negotiating the higher USB-PD voltage. This is not a defective battery — it resolves after one full charge cycle as the cell's impedance drops into the expected range. If fast charge still does not activate after the second cycle, check that the USB-PD cable and adapter are rated at the correct wattage for this device.