How to Tell if Xhorse Dolphin II Battery is Dead?

 XHORSE Dolphin XP005L Battery Working Principle & Charging Failure Analysis:

1. Battery Structure

• The battery consists of 7 individual cells managed by a Battery Management System (BMS).

2. BMS Communication Failure Symptoms

• If the battery charge level is missing from the display, the BMS has stopped communicating. Possible causes:

  • The green connector is not fully seated in the battery pack.

• • The BMS entered sleep mode due to critically low pack voltage (non-recoverable if voltage drops too low).

3. Charging Failure Causes

• Failed cell(s): A single faulty cell can prevent charging.

• Voltage imbalance: The BMS halts charging if cell voltages deviate beyond safe limits.

A battery refusing to charge can be caused by a failing cell in the battery pack. To diagnose:

1. Go to Settings and touch the Battery to open the battery screen.

2. On the VS, you will see the voltage of each cell.

3. The 8th and final voltage reading shows the difference between the highest and lowest cell voltages.

The BMS will likely stop charging if it detects an abnormal cell voltage.