Highscreen Omega Q TBW5931 Compatible Battery 3.7V 1600mAh

Highscreen Omega Q — 3.7V Li-ion Replacement Battery (TBW5931)

This is a 3.7V, 1600mAh Li-ion cell for the Highscreen Omega Q smartphone. It replaces the original TBW5931 battery when the existing cell no longer holds a charge or shuts the phone down unexpectedly. Capacity is 5.92Wh — matching the original specification.

• Omega Q cell fitment: The Omega Q uses a fixed battery bay with dimensions 60.48 × 56.85 × 4.50 mm. This cell matches that footprint exactly, so the connector seats without force and the rear cover closes flush.
• Bench tested on actual hardware: We cycled the TBW5931 through charge and discharge on a test rig monitoring BMS cutoff thresholds. The protection circuit tripped correctly at the low-voltage floor and accepted charge current without thermal event.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging runs into an uncalibrated state.

Why the Omega Q reports wrong battery percentage after a cell swap

The Omega Q's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual cell chemistry. The gauge reads voltage and translates it to a percentage using old data — so it reports numbers that are off by 10–20%. One full discharge to automatic shutdown followed by a complete charge resets the coulomb counter and rebuilds an accurate curve. After that single cycle, percentage readouts stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — the modem transmitting or the screen at full brightness pulls enough current to push cell voltage below the BMS protection threshold even though the gauge still shows charge remaining. A fresh cell with an uncalibrated fuel gauge is the most common cause. Run one full discharge cycle without fast charging to let the gauge recalibrate its voltage-to-capacity mapping. If shutdowns continue after two full cycles, check that the connector is fully seated — a loose contact raises internal resistance and accelerates the voltage sag under load.