ELF0160 O2 XDA Nova Replacement Battery 3.7V 1100mAh

O2 XDA Nova — 3.7V Li-ion Replacement Battery (ELF0160)

This is a 3.7V, 1100mAh Li-ion cell built to replace the original battery in the O2 XDA Nova smartphone. It fits the XDA Nova directly, matching the OEM connector and physical footprint. Voltage and capacity match the original spec — 3.7V nominal, 4.07Wh total energy.

• XDA Nova platform fit: The XDA Nova runs a single-cell Li-ion configuration with a low-profile connector and compact cell envelope. This battery matches that form factor at 51.53 × 37.36 × 5.35mm, so the connector seats flush and the back cover closes without pressure on the cell.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the XDA Nova platform and monitored BMS cutoff behaviour. The protection circuit tripped correctly at the low-voltage threshold and accepted charge from the device's onboard charge IC without errors.
• Fuel gauge recalibration on first install: After fitting this cell, run one full discharge down to automatic power-off, then charge to 100% uninterrupted. This gives the XDA Nova's fuel gauge IC a clean reference curve against the new cell — without it, percentage readings will be inaccurate for the first several cycles.

Sudden shutdown at 20–30% on the XDA Nova after a cell swap

The XDA Nova's fuel gauge IC retains the discharge curve from the old, degraded cell. When a new cell is installed, the IC thinks the battery is at 25% when the cell voltage is actually still healthy — but it hasn't mapped the new cell's lower internal resistance. Under modem or display load, the voltage rail dips briefly, the IC interprets that as a cutoff condition, and the phone shuts down. One full discharge-to-shutdown followed by a full charge resets the coulomb counter and maps the new curve correctly.

O2 XDA Nova not powering on after sitting in storage

Li-ion cells self-discharge in storage. If the XDA Nova sat unused for several months, the cell voltage may have dropped below 2.5V — the threshold where the BMS locks out to prevent damage. The phone will show no response to the power button or charging cable. Connect to a charger and leave it for 15–20 minutes without attempting to power on; the charge IC will trickle current into the cell until voltage recovers above the BMS re-enable threshold, typically around 2.9V, after which normal charging resumes.