winbasic 12V 1.2Ah Auxiliary Battery for Mercedes‑Benz — OE N000000004039 Plug-and-Play Direct Replacement

winbasic 12V 1.2Ah auxiliary battery is a direct-replacement auxiliary battery compatible with Mercedes‑Benz models using OE part N000000004039 from 2007–2023.

This compact 12-volt, 1.2 amp-hour auxiliary battery is built to match the fit and electrical specifications of the Mercedes‑Benz original equipment (OE) part N000000004039. It serves as the small secondary battery commonly used for retaining settings, powering control modules, and supporting vehicle electronics when the main battery is offline during service or key-off conditions. winbasic designed this unit for plug-and-play installation to minimize downtime and preserve system calibrations.

Which Mercedes-Benz models use this auxiliary battery?

The winbasic 12V 1.2Ah battery fits Mercedes‑Benz vehicles that specify OE part number N000000004039 for their auxiliary power module. It spans model years roughly between 2007 and 2023, depending on factory options and regional equipment levels. Always confirm the OE number on your existing battery or vehicle documentation before ordering.

• Direct-replacement for OE N000000004039
• Covers model years 2007–2023 where that OE part is specified
• Compatible with vehicles using a small 12V auxiliary module

How easy is installation and what should I prepare?

Installation is straightforward for technicians and competent DIYers: this battery is made to the same physical footprint and electrical connections as the OE part to allow plug-and-play replacement. Prior to replacement, disconnect the main battery or follow the vehicle manufacturer’s service procedure to avoid data loss. Keep basic hand tools and electrostatic precautions on hand when swapping the unit.

• Direct-fit connectors match OE layout
• Follow vehicle-specific battery isolation steps
• Have basic tools and protective gloves ready

What are the electrical and part-number details I should verify?

This battery is rated at 12 volts and 1.2 amp-hours, and is listed to interchange with Mercedes part N000000-004039 (and related numeric variants). Confirm the interchange numbers on your original unit: 000000004039, N000000004039, 0000-00004039, N0000-00004039, or 00004039. Matching these identifiers is the simplest way to ensure compatibility.

• Voltage: 12 V
• Capacity: 1.2 Ah
• Interchange: N000000-004039 and listed variants

How does this auxiliary battery protect vehicle systems during service?

When the main battery is disconnected for repair or replacement, the auxiliary battery keeps memory circuits, control modules, and comfort settings supplied with power to prevent resets. Using a correct-spec auxiliary battery helps avoid software faults, long system re-learns, and time-consuming recalibrations after service. If you want to preserve radios, navigation, and electronic modules, replace with a matching auxiliary unit.

• Maintains module memory during main battery disconnect
• Reduces likelihood of ECU or convenience module resets
• Saves time on post-service reprogramming and calibrations

Who is this for: Technicians, fleet maintenance managers, and Mercedes‑Benz owners seeking a reliable, direct-replacement auxiliary battery to match OE part N000000004039. Ideal for workshop installs, roadside repairs, and scheduled battery service where preserving vehicle electronics and saving diagnostic time are priorities. Confirm the part number on your vehicle before purchase to ensure exact compatibility.