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Black rectangular unit with OBDII cable and green amber LEDs

WUQ

WUQ MS4000 Automotive Memory Saver with Built-in Charger, Black

SKU CH-KZ5X-2417W

Preserves vehicle codes and settings during battery changes via OBDII with a built-in 12 V 4.5 Ah charger and 4 A circuit breaker

  • Product typeCar Charger
  • Preserves vehicle codes & settings during battery swaps
  • Built-in 12 V 4.5 Ah sealed lead-acid battery
  • Direct-wired OBDII connector plugs straight into the port
  • Green LED confirms circuit connection; amber LED warns at 11.6 V
  • 4 A circuit breaker protects anti-theft radio, clock, keyless entry & more

Automotive Memory Saver MS4000

The WUQ MS4000 is an automotive memory saver designed for vehicle owners and technicians who need to preserve electronic settings during starter battery replacement. It connects through the vehicle OBDII port and maintains power to systems such as anti-theft radios, clocks, keyless entry and TPMS while the main battery is disconnected.

Built-in Charger & Protection

A 12 volt 4.5 amp hour sealed lead acid battery is housed inside the unit and a built-in charger keeps it topped up. A 4 amp circuit breaker protects the vehicle electronics and a green LED confirms a live connection while an amber LED warns when the internal battery drops to 11.6 volts or below.

Compatibility Check

Verify that your vehicle has an accessible OBDII port and that the port supplies constant power with the ignition off. Confirm the 12 volt system voltage matches the unit and ensure you have space to position the device near the port during the battery swap.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $165.99
Pricier than about 90% of the 2,768 comparable items (median $21.99).

Specifications

Product
Product typeCar Charger

Questions about this item

How does the OBDII connector power the vehicle's memory when the starter battery is disconnected?

The direct-wired OBDII connector plugs into the vehicle's port and supplies 12 volts from the internal 4.5 amp hour sealed lead acid battery to retain drive-ability codes, anti-theft radio presets, clock settings, keyless entry codes and TPMS data.

What physical space and access are needed to use the MS4000?

You need access to the vehicle's OBDII port — typically under the dashboard — and enough room for the unit itself, which houses the internal 12 volt battery and a built-in charger.

How do you install the MS4000 and what step is often missed?

Plug the OBDII connector into the vehicle's port; the green LED confirms circuit connection. The step often missed is checking the amber LED: if it lights, the internal battery is at 11.6 volts or lower and must be recharged using the built-in charger before relying on the unit.

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