Launch X631 OBD Scanner Compatible Battery 7.4V 3800mAh

Launch X631 / X631+ — 7.4V Li-Polymer Replacement Battery (INR148650 2S2P)

This is a 7.4V 3800mAh (28.12Wh) lithium-polymer replacement battery for the Launch X631 and X631+ automotive diagnostic scanners. It slots into the same bay as the original and restores cordless operation for fault code reading, system diagnostics, and emissions data retrieval. Voltage and cell count match the OEM specification exactly.

• X631 and X631+ compatibility: Both models use the same 7.4V two-cell lithium-polymer architecture with an identical connector and BMS handshake protocol. The INR148650 2S2P configuration — two cells in series, two in parallel — matches the original pack's cell layout, so the scanner's power management firmware recognises the replacement without firmware flags.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on the X631 platform. The BMS engaged low-voltage cutoff cleanly at the expected threshold and accepted a full charge from the scanner's internal charge circuit without thermal events or charge rejection.
• Pre-swap data export: Export all saved vehicle profiles and diagnostic logs before removing the battery. The X631 stores session data in RAM backed by the main battery pack — pulling the battery without exporting first will erase any unsaved vehicle records.

Why the X631 won't boot after a battery swap

A freshly installed lithium-polymer pack often ships at a storage charge of around 3.6–3.7V per cell — below the X631's boot threshold. The scanner's power circuit requires a minimum pack voltage to initialise the display and main processor. Plugging into AC power and charging for 20–30 minutes before pressing the power button is usually enough to clear this. If the unit still won't boot, confirm the pack voltage reads at least 7.2V at the terminals before re-seating.

Wireless connection dropping mid-diagnostic session

The X631's WiFi or Bluetooth link to a vehicle's OBD port draws a secondary power rail that becomes unstable as battery voltage sags below around 7.0V. At that point the radio module loses stable supply before the battery indicator shows critical. The result is a dropped connection mid-session, sometimes mid-scan, which can leave the vehicle ECU in an interrupted state. If connections drop repeatedly, check pack voltage under load — if it dips below 7.0V during active scanning, the battery has degraded and needs replacement.