About this replacement
Autel MaxiSys MS908 / MS908P Pro — 3.7V Li-Polymer Replacement Battery (MLP4395B2)
This 3.7V, 11000mAh Li-Polymer battery replaces the original MLP4395B2 / MLP4795117-2P pack in the Autel MaxiSys MS908, MS908P Pro, MaxiSys CV, and MS908CV diagnostic scanners. It fits the large-format tablet body used across this scanner family. Voltage and physical dimensions match the OEM spec: 188.36 × 119.00 × 4.38mm.
- MS908 / MS908P Pro / CV series fitment: These models share a common tablet chassis, connector pinout, and BMS handshake protocol. The same battery cell format and communication lines run across the entire platform, so one pack covers all listed variants without modification.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the MS908 platform. The BMS negotiated correctly with the scanner's charge controller, cell balancing activated normally, and no fault flags appeared in the battery status screen.
- Data export before swap: Vehicle profiles, ECU data logs, and saved VIN records on the MS908 are held in RAM segments that draw from the main battery. Pull power without exporting first and that data is gone. Use the MaxiSys data manager to push all profiles to a USB drive or cloud account before removing the old pack.
Why the MS908 won't boot after a battery swap
The MS908 has a minimum cell voltage threshold built into its boot sequence — if the replacement pack ships at storage voltage (typically around 3.3V per cell), the scanner refuses to start. This is not a faulty battery or a failed install. Connect the scanner to the OEM charger and leave it for at least 30 minutes before pressing the power button. Once cell voltage climbs above the boot threshold (approximately 3.6V), the scanner will start normally.
Wireless link dropping mid-diagnostic session
The MS908 runs its Wi-Fi and Bluetooth stack from the same power rail as the display. When battery voltage sags under load — common with an aged or deeply discharged pack — the radio module drops signal before the battery indicator shows critical. Technicians see it as a disconnection from the vehicle VCI or a dropped shop network link mid-session. Fitting a full-capacity replacement pack restores stable voltage to that rail. If dropouts continue after swap, check that the new pack has been fully charged to 4.2V before use in an active diagnostic session.