EZRED MS4000 Automotive Memory Saver with Built‑In 12V Charger — OBDII Backup, 4.5Ah Battery

The EZRED MS4000 is a compact automotive memory saver with a built‑in 12V charger that preserves vehicle settings while the main battery is disconnected.

The MS4000 combines a sealed 12‑volt, 4.5 Ah lead‑acid backup battery with a hardwired OBDII plug so you can change or replace a car battery without losing radios, clocks, anti‑theft codes, TPMS data or other electronic settings. LED indicators show when the unit is connected and when the internal battery needs replacement, while an integrated 4‑amp circuit breaker protects the unit during use.

How does the MS4000 keep vehicle settings safe during a battery swap?

Plug the MS4000 directly into your vehicle’s OBDII port before removing the main battery; the internal backup battery supplies essential power to memory circuits so settings remain unchanged. This avoids reprogramming anti‑theft radios, clocks, navigation presets and other modules.

• Direct wired OBDII connector for an immediate, secure connection
• 4.5 Ah sealed lead‑acid internal battery provides stable backup voltage
• Maintains driveability codes, ECU memory, and accessory settings

What indicators and protections does it include?

The MS4000 uses a green LED to confirm a good connection to the vehicle circuit and an amber LED to warn when the internal battery is low (around 11.6 V). A built‑in 4‑amp circuit breaker prevents overloads or short circuits, helping protect both the tool and the car’s electronics.

• Green LED confirms proper hookup to vehicle power
• Amber LED signals internal battery nearing end‑of‑life
• 4‑amp circuit breaker for overload and short‑circuit protection

Can the MS4000 recharge itself, and how long will the backup battery last?

The MS4000 includes a 4.5 Ah sealed lead‑acid battery that can hold enough charge to maintain memory circuits during typical battery changes. While it is not a full vehicle starter charger, it is sized to preserve settings for the duration of replacement or diagnostics; replace the internal cell when the amber LED indicates low voltage.

• 12V, 4.5 Ah sealed lead‑acid battery installed inside the unit
• Meant for temporary memory preservation, not starting a vehicle
• Replace internal battery once amber LED indicates 11.6 V or less

How do professionals and DIYers use the MS4000 in real work?

Technicians and home mechanics use the MS4000 whenever the vehicle’s battery must be disconnected for service, diagnostics or replacement. It’s convenient for preserving settings during routine maintenance, module replacement, or when vehicles are stored and undergo electrical work.

• Plug into OBDII before disconnecting the battery for uninterrupted memory
• Useful during starter replacement, battery maintenance, or ECU work
• Compact, rugged housing suitable for shop benches and home garages

Who is this for? The EZRED MS4000 is aimed at automotive technicians, mobile mechanics, fleet managers and informed DIY enthusiasts who need a reliable, plug‑and‑play solution to protect vehicle electronic memories during battery service. If you routinely swap batteries, work on vehicle electrical systems, or maintain vehicles with sensitive anti‑theft and infotainment programming, the MS4000 offers a simple way to avoid time‑consuming reprogramming and retain stored settings.