ERA WIZA16 MDA Vario Replacement Battery 3.7V 2800mAh

ERA MDA Vario — 3.7V Li-ion Replacement Battery (WIZA16)

This 3.7V, 2800mAh Li-ion cell replaces the WIZA16 battery in the ERA MDA Vario smartphone. It powers core functions including calls, messaging, and applications. Capacity is rated at 10.36Wh and dimensions are 51.86 × 38.97 × 12.48mm — verify your existing cell matches before fitting.

• MDA Vario platform fit: The WIZA16 form factor is specific to the MDA Vario chassis. The connector pinout and BMS handshake are matched to the device's charge IC — fitting an off-spec cell risks failed charge negotiation or BMS lockout.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the MDA Vario platform. The BMS negotiated correctly with the device charge IC, voltage held stable under screen-on and modem load, and no mid-cycle cutoff events were recorded.
• First-cycle fuel gauge reset: On first use, disable fast charging and run one full discharge-to-charge cycle without interruption. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the MDA Vario after a cell swap

This is a voltage cliff failure. An aged or poorly matched cell cannot sustain voltage under the combined load of the modem radio and screen backlight — both spike current simultaneously. The device's protection circuit reads the resulting voltage sag as a critically low state and shuts down, even though the fuel gauge still shows charge remaining. Running one full uninterrupted discharge cycle lets the coulomb counter map the new cell's actual voltage-to-capacity curve. After that cycle, the reported percentage and the real cutoff voltage align and unexpected shutdowns stop.

MDA Vario reporting wrong battery percentage after fitting this cell

The fuel gauge IC on the MDA Vario was calibrated to the discharge curve of the original, degraded cell. A fresh 2800mAh cell has a different curve — the IC misreads state-of-charge and reports inaccurate percentages, often jumping erratically. The fix is one complete discharge from 100% to auto-shutdown, followed by a full uninterrupted charge to 100%. After that single cycle, the coulomb counter resets its reference points against the new cell. Subsequent readings should be accurate within a few percent.