Volkswagen Arteon 3H 2017 Emergency Battery 7.4V 2600mAh

Volkswagen Arteon 3H / Atlas Cross Sport CM — 7.4V Li-ion Replacement Battery

This 7.4V 2600mAh Li-ion battery replaces the factory emergency supply cell found across multiple Volkswagen platforms, including the Arteon 3H (2017) and Atlas Cross Sport CM (2020–2023). It powers the vehicle's emergency assistance system — keeping hazard lighting and crash-notification circuits active when the main 12V battery fails. Capacity is 2600mAh (19.24Wh), matching OEM specification.

• Multi-platform fitment: These Volkswagen models share a common emergency supply module architecture — same voltage rail at 7.4V, same physical cell format (66.30 × 37.20 × 18.60mm), and the same BMS handshake protocol. That's why one cell covers platforms from the Arteon 3H through to the Caddy SB (2021) and Camper SH (2020), plus 27 additional variants.
• Bench tested on actual hardware: We cycled this cell through the emergency supply module's charge acceptance routine and monitored BMS communication. The management system accepted the battery without error flags, and the cell held stable voltage under the standby draw profile the module imposes between charge events.
• Post-install charge cycle requirement: The Volkswagen emergency supply module runs a firmware-level battery validation sequence after any cell replacement. Connect the vehicle to a charger or run the engine until a full charge cycle completes — the module will not log the battery as trusted until it sees a full charge state from the new cell.

Why the emergency supply module rejects a new cell on first power-up

Volkswagen's emergency supply firmware tracks charge history, not just present voltage. A brand-new cell arrives at a partial state of charge, and the module interprets that as an uncalibrated or degraded unit. Until it logs a complete charge event, it holds the battery in an unverified state and may trigger a warning in the instrument cluster. Allowing a full charge cycle — typically two hours with the engine running or connected to a mains charger via the OBD port — clears that flag and moves the cell to active standby status.

Emergency supply self-test failing after battery swap

The module runs a self-test at each ignition cycle to confirm the emergency battery can sustain the minimum voltage required for hazard and telematics circuits. If the new cell hasn't completed a full charge-discharge calibration cycle, the self-test reads an incomplete capacity estimate and fails. This isn't a faulty battery — it's a management system calibration gap. Run one full charge to 8.4V (the 7.4V nominal cell's full-charge ceiling), then allow the module to discharge it lightly through normal standby use, and the self-test will pass on the next ignition cycle.