Hyundai Ioniq 5 Battery Health Check

Hyundai Ioniq 5 — Battery Overview

The Hyundai Ioniq 5 is one of the most critically acclaimed EVs on the UK market, built on Hyundai's E-GMP platform. It is available with two battery sizes: the Standard Range (58 kWh) and the Long Range (77.4 kWh), in both rear-wheel-drive and all-wheel-drive configurations. WLTP range is approximately 240 miles for the Standard Range and up to 315 miles for the Long Range RWD variant.

A standout feature of the Ioniq 5 is its 800V electrical architecture, enabling ultra-fast charging from 10–80% in around 18 minutes on a 350 kW charger. The vehicle uses a liquid-cooled battery thermal management system and NMC battery chemistry.

Common Battery Concerns

The Ioniq 5 is generally well-regarded for battery reliability, but dealers should note:

  • Ultra-fast charging frequency — The Ioniq 5's rapid charging capability is a key selling point, but vehicles that have been charged exclusively at high-power stations may show marginally higher degradation than those with a mix of AC and DC charging.
  • Software-reported SoH — Hyundai does not make SoH easily accessible to owners through the standard dashboard or app. This creates uncertainty for buyers, making independent certification even more valuable.
  • Battery recall history — Some early Ioniq 5 production was subject to a battery cell recall in certain markets. While most affected vehicles have been remediated, an independent health check provides additional assurance.
  • Vehicle-to-Load (V2L) usage — The Ioniq 5 supports bidirectional charging, allowing owners to power external devices. Heavy V2L usage adds charge cycles, which could contribute to long-term degradation.

How the AVILOO FLASH Test Works on the Ioniq 5

Testing follows the same simple process:

  1. Plug the AVILOO Box into the OBD-2 port (located below the dashboard on the driver's side)
  2. Wait approximately three minutes — the vehicle remains stationary
  3. Receive a TÜV-certified battery health certificate immediately

The test works on both Standard Range and Long Range variants, in all drivetrain configurations.

What the Certificate Shows

The AVILOO certificate for a Hyundai Ioniq 5 includes:

  • State of Health (SoH) — independently calculated, filling the gap left by Hyundai's own limited SoH visibility
  • Cell-level heatmap — condition of each cell module with colour-coded severity
  • Certified energy (SoCE) — confirmed remaining capacity in kWh
  • Range estimates — real-world range based on actual battery condition
  • Peer benchmarking — how this Ioniq 5 compares to others of the same age and mileage
  • QR code for buyer verification

Since Hyundai does not readily expose SoH data to owners, a TÜV-certified certificate is particularly impactful on Ioniq 5 listings — it provides information buyers cannot easily obtain themselves.

Dealer Protection

The Consumer Rights Act 2015 places the burden of proof on dealers for faults within six months of sale. A certificate issued at point of sale protects you from disputes and strengthens your listing against uncertified competitors.

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