Hard starting, dashboard warnings, or sudden electrical failures are often battery- or charging-related. We test and replace with the correct OEM-spec battery.
BOOK BATTERY SERVICEConductance-based load test measures CCA capacity and internal resistance — identifies a weak battery before it fails.
Alternator output, regulator voltage, and parasitic drain tested to ensure the new battery will not discharge prematurely.
AGM and EFB batteries fitted to OEM specification with battery registration (BMS coding) where required by the manufacturer.
Hard starting, dashboard warnings, or sudden electrical failures are often battery- or charging-related. Hallmark performs a complete battery and alternator health check, then replaces with the correct OEM-spec battery for your vehicle.
Fault codes related to battery, alternator and power supply modules are extracted and logged.
Load test and alternator output measured. Results compared against vehicle specification to confirm fault.
Correct-spec battery fitted. BMS registered via diagnostic tool on BMW, Mercedes, Porsche, Audi and Jaguar models.
Post-repair scan confirms no residual faults. Charging voltage verified at idle and under load.
A conductance load test tells us the internal state of health. A battery that charges fully but fails under load needs replacement. We perform this test before recommending any parts.
Yes. BMW, Mercedes-Benz, Porsche and several other brands require the new battery to be registered with the BMS via a diagnostic tool. We carry the required software for all brands we service.
We fit Varta, Bosch and Exide AGM/EFB batteries — the same manufacturers supplying the OEM lines for European marques. Specifications are matched to the vehicle build sheet, not substituted with a universal battery.
Audi petrol and diesel engines, DSG transmission, quattro drivetrain and MMI infotainment serviced with VCDS and OEM-level diagnostic tools.
Bentley Continental, Flying Spur, and Bentayga serviced with factory-level tooling. W12, V8 and V6 hybrid engines, ZF 8-speed transmission, and all-wheel drive systems.
BMW petrol and diesel engines, xDrive, M-sport and M models serviced with ISTA diagnostic tools. N20, N55, B58, S58, M57 and S63 engine specialists.
Bugatti Veyron and Chiron serviced under strict manufacturer protocols. W16 engine, DSG sequential gearbox, and active aerodynamics specialist.
Ferrari V8, V10 and V12 naturally aspirated and turbocharged engines serviced. F-type transmission, E-diff and adaptive suspension diagnostics.
Jaguar F-Pace, F-Type, XE, XF and XJ serviced with Jaguar SDD diagnostic software. Ingenium petrol and diesel engines, ZF transmission and air suspension.
Lamborghini Huracán and Urus serviced with factory-level diagnostic tools. V10, V8 twin-turbo, and e-Hybrid powertrain specialists.
Land Rover Discovery, Defender, Range Rover and Range Rover Sport serviced with Jaguar Land Rover SDD. Air suspension, Terrain Response, and Ingenium engine specialists.
Maserati Ghibli, Levante, GranTurismo and Quattroporte serviced. Ferrari-derived V6 and V8 engines, ZF transmission and active suspension diagnostics.
McLaren 570S, 720S, GT and Artura serviced with McLaren STAR diagnostic tools. 3.8 and 4.0 twin-turbo V8, and P1 / Artura hybrid powertrains.
Mercedes-Benz C-Class to S-Class, GLE, AMG and EQ serviced with XENTRY diagnostic tools. OM diesel, M petrol, AMG V8 and EQ electric powertrain specialists.
Porsche 911, Cayenne, Macan, Panamera and Taycan serviced with PIWIS diagnostic tools. Boxer, V6, V8 and electric drive specialists.
Rolls-Royce Ghost, Phantom, Cullinan and Wraith serviced to Rolls-Royce factory specification. BMW-Group N74 V12, ZF transmission and Magic Carpet Ride air suspension specialists.
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