DEXP IXION X lte 4.5 Compatible Battery 3.7V 1600mAh Li-ion

DEXP IXION X LTE 4.5 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1600mAh Li-ion replacement battery for the DEXP IXION X LTE 4.5 smartphone. It fits directly into the battery compartment of this 4.5-inch Android handset. Voltage and capacity match the original cell specification.

• IXION X LTE 4.5 compatibility: The IXION X LTE 4.5 runs a single-cell Li-ion pack at 3.7V nominal. The charge IC and BMS on this board expect that voltage rail and a standard Li-ion charge profile — this cell matches both, so no firmware flags or charge rejection on pairing.
• Bench tested on actual hardware: We cycled this cell through a full charge and discharge sequence, confirmed BMS handshake with the charge IC, and checked that the protection circuit trips correctly at low-voltage cutoff. No charge rejection was observed on the first cycle.
• Fuel gauge recalibration after install: On first use after installation, disable fast charging and run one complete discharge-charge cycle before resuming normal use. This lets the fuel gauge IC build an accurate discharge curve against the new cell — pushing fast-charge current into an uncalibrated cell can cause the percentage counter to drift by 10–15%.

Sudden shutdown at 20–30% on the IXION X LTE 4.5

This is a voltage cliff issue, not a capacity issue. When the modem fires a data burst or the screen peaks in brightness, current draw spikes sharply. An aged or uncalibrated cell cannot hold voltage under that load — it drops below the BMS cutoff threshold and the phone shuts off even though the fuel gauge still shows charge. The fix is a full recalibration cycle: discharge to automatic shutdown, then charge uninterrupted to 100% without using the phone. After one full cycle, the coulomb counter re-anchors its end points and the cliff shifts back toward 0–5%.

Phone reports wrong battery percentage after cell swap

The fuel gauge IC on the IXION X LTE 4.5 stores a learned discharge curve from the old cell. A new cell has different internal resistance and a slightly different voltage-to-capacity slope, so the IC maps charge state incorrectly until it relearns. This shows up as percentage jumping erratically or the phone reporting full charge while shutting down minutes later. Run one uninterrupted discharge to zero, then a full charge to 100% — this forces the IC to recalibrate its endpoints against the new cell. After that cycle, percentage reporting should stabilise within 2–3%.