Mon – Fri 9:30am – 5:30pm · Sat 10am – 3pm
Specialist HV battery testing, charge port inspection, on-board charger and DC/DC converter checks - keep your range and your charging speeds where they should be. From £109.
From
£250
Final quote will be confirmed after vehicle registration and assessment
Estimated 1.5 hrs
Prices shown are starting prices. Final cost depends on your vehicle's make, model, and condition. We always provide a free estimate before starting work.
The high-voltage battery is one of the most valuable and technically complex components in an electric vehicle. Alongside the vehicle’s charging system, it is also one of the areas where accurate diagnosis is essential. A reduction in driving range, slow charging or intermittent charging faults do not necessarily mean the battery itself has failed.
At Doyen Auto Services in Dumbarton, we provide specialist EV battery and charging-system diagnostics designed to identify the underlying cause of performance and charging issues. Using appropriate EV diagnostic equipment and manufacturer-specific data where available, we assess the condition and operation of the relevant high-voltage and charging systems rather than relying on assumptions based purely on symptoms.
Our EV battery and charging diagnostics can include:
* High-voltage battery State of Health (SOH) assessment * Battery State of Charge (SOC) analysis * Battery cell and module voltage monitoring * Cell-balance analysis * Battery temperature and thermal-system checks * High-voltage system fault-code diagnosis * Charging-port inspection * AC charging system diagnostics * DC fast-charging system diagnostics * On-board charger (OBC) functional checks * DC/DC converter diagnostics * Charging communication fault investigation * High-voltage isolation fault diagnosis * Charging cable and connector inspection
If your EV has experienced a noticeable reduction in range, inconsistent charging, reduced DC fast-charging performance, charging interruptions or problems connecting to an AC home charger, professional diagnostics can help determine whether the issue is related to the battery, charging equipment, vehicle communication systems or another component.
For example, reduced charging speed does not automatically indicate a deteriorating battery. Charging temperature, battery State of Charge, battery thermal management, charger capability, charging infrastructure and vehicle protection strategies can all affect charging performance.
We can also inspect the condition of the vehicle’s charging connections and, where appropriate, assess charging cables for signs of damage, wear or degradation. A faulty cable, connector or charging interface can cause intermittent charging problems that may otherwise be incorrectly attributed to the high-voltage battery.
Where required, we can also provide guidance on home-charging arrangements and good charging practices. Correct charging behaviour, appropriate battery temperature management and avoiding unnecessary extremes of State of Charge can help support long-term battery health.
High-voltage EV systems require specialist safety procedures and appropriate equipment. Our diagnostic approach is therefore based on the vehicle’s specific high-voltage architecture and manufacturer requirements. We do not make assumptions about battery condition without supporting diagnostic evidence.
Case-by-case pricing. The figures below are starting “from” prices - your final quote depends on your vehicle's make, model, and condition.
EV Battery & Charging Service
We always provide a free, no-obligation quote before any work begins. Call 07760 926245 or WhatsApp 07760 926245.
Here’s what to expect when you bring your vehicle to Doyen Auto Services
Battery SOH, cell-balance, and full diagnostic scan to capture any pending battery / charging fault codes.
Charge port inspected, on-board charger tested at AC and DC, DC/DC converter measured.
Written report with SOH figure, charging-system test results, and any recommendations.
We’re a specialist automotive garage in Dumbarton, with the equipment, experience, and honest approach to get the job done right first time.
Specialist HV diagnostic tools - we read directly from the battery management system
Real data, not guesswork - your SOH is logged and trended visit-over-visit
Independent advice on whether a battery issue is genuinely a fault or just expected wear
Dumbarton-based - no need to ship the car to a main dealer
Common questions about this service at Doyen Auto Services
Starting from
£149
Annual full service for electric vehicles. Battery state-of-health, cooling system, brake fluid, HV cables, software updates - the works. From £149.
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£100
Advanced fault diagnostics for electric vehicles - ECU/module testing, wiring analysis, HV system fault tracing, CAN-bus diagnostics. From £60.
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£50
Entry-level health check for electric vehicles - visual inspection of high-voltage components, brakes, tyres, lights and a full diagnostic scan. From £59.
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£270
Two-yearly EV major service. Brake fluid + coolant replacement, drive motor and inverter inspection, charging system test, full HV safety check. From £219.
Get in touch today to book your ev battery & charging service at our Dumbarton workshop. Online booking or call us directly.
Unit 8, Levenside Business Court, Dumbarton G82 3PE · Mon–Fri 9:30am–5:30pm, Sat 10am–3pm
Our objective is to provide a clear technical assessment of the EV’s battery and charging system, helping identify whether the problem is with the battery, charging system, communication, thermal management or another related component before expensive parts are considered for replacement.
Doyen Auto Services Ltd Unit 8, Levenside Business Court, Dumbarton, G82 3PE 0141 467 2904 | 07760 926245
