Annual EV & Hybrid Health Check North London
- IMI TechSafe Certified
- Price from £120+VAT
- Service time 60-90 minutes
- Digital report included
Our annual check keeps your EV or Hybrid performing at its best.
For EVs it covers battery, charging and software compliance, while for Hybrids it also includes engine and transmission inspections.
All carried out under HSE-approved high-voltage safety protocols by IMI TechSafe technicians.
Quotes & Workshop Appointments
Looking for a quote for one of our services, or would you like to arrange an appointment at our workshop to have your electric or hybrid vehicle diagnosed or repaired? Please complete our workshop enquiry form.
Other Enquiries
For general questions or any other enquiries, please contact us by email. To request a quote or arrange a workshop appointment, please submit a workshop enquiry.
High-Voltage Battery & State of Health (SoH)
Your EV’s HV battery is tested for SoH (State of Health) — the percentage of remaining capacity versus when new. Most OEMs consider 70–80% SoH as the threshold for warranty claims (Faraday Institution, n.d.).
This chart illustrates the typical reduction in an electric vehicle’s battery health as mileage increases.
A new EV starts with 100% capacity, but gradual chemical ageing and cycling reduce performance over time.
By 100K miles, most batteries operate at around 85% SoH, which equates to a noticeable reduction in driving range and may trigger warranty considerations.
The visual trend highlights why regular SoH checks are important for predicting lifespan, planning maintenance, and protecting warranty coverage.
We don’t stop at percentages
Our technicians check:
- Diagnostic trouble codes (DTCs): Common early warnings include P0AA6 (HV isolation fault) and P0A0F (HV system shutdown).
- Cell balance: Voltage spread across modules.
- Internal resistance: Higher resistance reduces range and efficiency.
- Isolation resistance: Detects coolant ingress or wiring degradation.
Average SoH Decline in UK EVs
(Based on research data)
| Mileage (miles) | Average SoH Decline (%) | Typical Range Loss (%) |
|---|---|---|
| 0–20K | 0–3% | Negligible |
| 20K–60K | 3–8% | 5–10% |
| 60K–100K | 8–15% | 10–20% |
| (Source: Faraday Institution, n.d.; DEFRA, 2023) | ||
Thermal Management & Cooling Systems
Cells degrade rapidly above 40°C and lose efficiency below 0°C (Faraday Institution, n.d.). Our inspection covers:
- Coolant levels and flow testing.
- Leak detection using pressure checks.
- Thermal sensor calibration.
- BMS thermal strategy verification.
Case study: In one London taxi fleet, 3 of 20 vehicles showed reduced range traced to blocked cooling passages — detected before failures occurred.
Powertrain, Charging & Compliance
We test inverters, motors, and gear reduction units, alongside charging compliance with the UK Public Charge Point Regulations 2023 (DfT, 2024). This includes:
- Load testing: Confirming charger delivers rated current.
- Insulation testing: Detecting breakdown under load.
- Handshake validation: Ensuring communication between vehicle and charger is
fault-free.
All ECU versions are logged and compared against OEM release notes, in line with UNECE R155 (cybersecurity) and R156 (software update management) (UNECE, 2021a; UNECE, 2021b).
Brakes, Regen Systems
Regenerative braking reduces pad/disc wear by up to 90% in lab tests though DEFRA cautions results vary in real use (DEFRA, 2023; Bondorf et al., 2023).
This chart illustrates how regenerative braking becomes more effective as vehicle
speed increases. regenerative braking not only improves overall efficiency but also reduces wear on
friction brakes, cutting maintenance costs and extending component life.
Our service includes:
- Brake fluid testing.
- Friction brake wear measurement.
- Regen system calibration via OEM software where applicable.
ADAS Sensors Misalignment
Small errors in the alignment of ADAS (Advanced Driver Assistance Systems) sensors can significantly compromise vehicle safety.
Even a half degree shift can add measurable stopping distance, while a 1° misalignment typically increases braking distance by around 5%.
At 3°, the braking distance may extend by as much as 20%, meaning the vehicle could travel several extra metres before stopping in an emergency.
This visual emphasises why recalibration is essential after windscreen replacement, suspension adjustments, or collision repair, as required by Thatcham’s Insurance Industry Requirements.
ADAS calibration follows Thatcham IIR standards. Even a 1° misalignment can compromise emergency braking accuracy (Thatcham Research, 2023). We provide before/after calibration screenshots in your report for transparency.
Fleet & Commercial EV Services
- Provide predictive analytics on SoH and brake wear.
- Highlight underperforming vehicles.
- Optimise charging cycles to cut electricity costs.
- Generate bulk compliance reports for insurers and regulators.
For fleets, downtime equals lost revenue. Our fleet health checks integrate with telematics platforms to:
Case example: A delivery fleet reduced unexpected breakdowns by 22% after adopting predictive health checks over 12 months.
Safety Protocols: Beyond Basics
All technicians use:
- IEC Class 0/1 HV insulating gloves (up to 1,000V).
- CAT III/IV multimeters for HV testing.
- Insulated tooling and barriers as per HSE guidelines (HSE, n.d.).
This ensures compliance and minimises risks during diagnostics.
Technicians also undergo regular OEM-accredited training to stay updated on evolving EV standards, and emergency response drills are carried out quarterly to prepare for potential HV isolation or thermal runaway events.
Reporting, Warranty & Booking
Every vehicle receives a digital health report covering:
- SoH % and balance with historical trend data where applicable.
- Thermal and charging system test results where applicable.
- DTC logs and cleared codes.
- Warranty compliance notes.
Additional features include:
- Secure online portal with downloadable reports
- Integration with ERP/CMMS platforms for fleet managers
- Automated booking reminders based on mileage or time intervals
EV vs Hybrid Annual Check
EV Annual Check
- Battery SoH & thermal system test
- Charging compliance (AC & DC)
- Inverter & motor diagnostics
- Brake & regen calibration
- DTC & warranty compliance report
Focus: electronics & energy systems
Hybrid Annual Check
- All EV checks included
- Engine oil & filter inspection
- Cooling system (ICE & inverter)
- Transmission fluid & condition
- Exhaust & emissions compliance
Focus: combustion engine + electric integration
Book Your EV Health Check Now
Book today and receive a same-day digital report to protect your warranty and resale value.