Autel MaxiBAS BTMS OBD2 Memory Saver for 12V Vehicles — OBD-II bridge with voltmeter & polarity protection

The 2026 Autel MaxiBAS BTMS OBD2 Memory Saver keeps a vehicle’s electronic memories and presets powered while you remove or replace a 12V battery.

When a car battery is disconnected, many control modules can lose learned settings, radio presets, window positions, throttle adaptations and other stored data. The Autel MaxiBAS BTMS provides a simple, plug-and-play bridge from a 12V backup battery to the vehicle’s OBD-II port so those settings remain intact. Designed for technicians and DIYers, it adds a quick safety check with a built-in voltmeter, polarity protection, LED status lights and surge protection to prevent accidental damage during battery service.

How does the MaxiBAS BTMS prevent loss of vehicle settings?

Instead of relying on the vehicle’s drained battery, the MaxiBAS supplies steady 12V power through the OBD-II connector to preserve module memory while the main battery is removed. Its circuitry monitors voltage and blocks incorrect polarity so stored vehicle parameters aren’t reset or corrupted.

• Connects OBD-II plug to vehicle and clips to a 12V backup battery.
• Maintains power to the ECU, BCM, infotainment and window control modules.
• Built-in voltmeter confirms backup battery readiness before work begins.
• Polarity reverse protection stops current flow if clips are reversed.

Is it compatible with my car and how do I use it?

The MaxiBAS BTMS works with virtually all 12V OBD-II vehicles (generally 1996 and newer). Usage is a four-step routine: check the backup battery voltage, power off the vehicle, plug the device into the OBD-II port, then attach the red/black clips to the backup battery. LED indicators show connection success and whether the backup battery voltage is sufficient.

• Fits standard OBD-II ports found in most cars and light trucks.
• Red clip = positive, black clip = negative; connect to backup battery terminals.
• LEDs: two green = connected, three green = ≥10V, three red = <10V.
• Simple four-step procedure for safe battery removal or replacement.

What safety and protection features are included?

The tool includes surge protection and safeguards against reversed polarity to protect both the vehicle and the backup battery. The on-device voltmeter and clear LED feedback reduce guesswork, and built-in circuitry prevents current flow if an unsafe condition is detected.

• Reverse polarity detection to avoid damage from incorrect clip placement.
• Surge protection to reduce the risk of transient spikes during connections.
• LED voltage indication helps verify backup battery health before work.
• Backed by a 1-year warranty and a 30-day return/replacement policy.

How quickly will this fit into a shop workflow?

The MaxiBAS BTMS is built for fast integration into routine battery service—connect and confirm in under a minute, then perform battery removal or replacement without worrying about losing stored settings. Its compact, plug-and-play design makes it equally useful for mobile technicians and garage bays.

• Plug into the OBD-II port and clamp to backup battery in one quick step.
• LEDs provide immediate go/no-go feedback to accelerate service time.
• No special training needed; included instructions cover the four-step process.
• Small footprint stores easily with other battery service tools.

Who is this for: The 2026 Autel MaxiBAS BTMS OBD2 Memory Saver is aimed at auto repair shops, independent mechanics, fleet technicians and informed DIYers who perform battery replacement or electrical work and need to preserve vehicle electronic settings. If you routinely service 12V vehicles and want to avoid relearning procedures, reset faults or unexpected module behavior after battery work, this tool streamlines the process and reduces post-service troubleshooting.