Autel MaxiBAS BTMS OBD2 Memory Saver — 12V OBD2 Battery Backup with Voltmeter & Protection

The 2026 Autel MaxiBAS BTMS OBD2 Memory Saver is a compact tool that preserves vehicle electronic memories and settings by powering the ECU during 12V battery removal or replacement.

When you change or disconnect a car battery, modern vehicles can lose stored data such as radio presets, window calibration, throttle adaptation, and fault codes. The Autel MaxiBAS BTMS provides a straightforward OBD2-to-backup-battery connection that keeps the vehicle’s control modules powered so you don’t have to reprogram features or chase intermittent faults later. Built-in protection and a voltmeter make it easy to confirm a safe backup source before you begin work.

How does the MaxiBAS BTMS prevent lost settings during a battery swap?

The MaxiBAS BTMS plugs into the vehicle’s OBD2 port and connects to a separate 12V backup battery via heavy-duty clips, maintaining voltage to control units while the main battery is removed. This preserves adaptive values, positional data, and electronic presets that many systems require to operate correctly.

• OBD2 interface supplies power to vehicle ECUs while battery is disconnected
• Two battery clips (red positive, black negative) attach to an external 12V source
• Retains throttle adaptation, window/seat memory, radio and navigation settings
• Straightforward four-step procedure for safe battery replacement

Is the device compatible with my car and how do I connect it?

This tool works with essentially all 12V OBD2-equipped vehicles (generally 1996 and newer). One end is a standard OBD2 male connector; the other end has two insulated battery clips for secure attachment to a separate 12V backup battery.

• Fits 99% of modern 12V OBD2 vehicle ports
• Clip the red clamp to backup battery positive and black clamp to negative
• LED indicators confirm successful OBD2 and backup battery connection
• Works with common 12V shop batteries, portable jump packs, or bench supplies

What safety features and indicators does the MaxiBAS include?

The MaxiBAS BTMS includes a built-in voltmeter, reverse-polarity protection, surge protection, and a three-LED status array so you can verify voltage and connection status before starting. These safeguards reduce risk to vehicle electronics and help you troubleshoot connection issues quickly.

• Three LEDs show connection and voltage status (green for OK, red for low)
• Stops current flow if backup battery polarity is reversed
• Surge protection protects vehicle modules during connection
• Simple visual pass/fail makes pre-checks quick and reliable

How easy is it to use the MaxiBAS during a routine battery replacement?

Using the MaxiBAS requires just four clear steps: test the backup battery voltage, power off the vehicle, plug into the OBD2 port and attach the clips, then remove and replace the vehicle battery. The LED feedback helps you confirm that the backup has sufficient voltage (three green LEDs indicate ≥10V).

• Step 1: Test backup battery; three green LEDs = adequate voltage
• Step 2: Turn vehicle off before connecting
• Step 3: Plug into OBD2, attach clips to backup battery
• Step 4: Replace battery while ECU remains powered

Who is this for: The 2026 Autel MaxiBAS BTMS OBD2 Memory Saver is designed for professional technicians, independent mechanics, auto-electricians, and DIY enthusiasts who service 12V vehicles and want to avoid time-consuming reprogramming or calibration after battery work. It’s especially useful in repair shops, service bays, and for anyone who routinely performs battery replacements, diagnostics, or electronic module work and needs a reliable, portable memory-preservation solution.