GYSflash 125.12 Charger Cnt FV 5M Cables
£900.00
The GYSFLASH 125.12 CNT FV is a high-power, 120A connected battery support unit designed specifically for professional workshops and vehicle diagnostics. Featuring Flexible Voltage (FV) technology, it operates seamlessly on any mains supply (85V–265V) and comes equipped with heavy-duty 5-metre cables to ensure total stability during critical ECU flashing and reprogramming. With its advanced Connected Technology (CNT), users can customise charging curves via USB and track charging history. This versatile inverter charger supports Lead-Acid and Lithium (LiFePO4) batteries from 20 to 1500 Ah, offering four distinct modes: Diag+, Charging, Showroom, and Tester. Its robust, fan-less design ensures reliability in demanding workshop environments, providing the essential power headroom required for modern luxury vehicles from BMW, Mercedes-Benz, and JLR.
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GYSFLASH 125.12 CNT FV Battery Support Unit (5m Cables)
120A Maximum Power. The Ultimate Connected Diagnostic Charger.
Power Without Compromise. The GYSFLASH 125.12 Charger CNT FV is a high-power 120A charger designed for the most demanding workshops. Modern luxury vehicles (BMW, Mercedes, JLR) can draw over 100 Amps during ECU flashing; this unit provides the extra headroom needed to ensure total stability.
Featuring Connected Technology (CNT), it allows for full customization via USB. It incorporates Flexible Voltage (FV) technology to work on any mains supply (85V-265V) worldwide. This version is supplied with heavy-duty 5-meter cables (25mm²) to ensure no voltage drop, even when the unit is wall-mounted away from the vehicle.
Why Choose 125.12 CNT?
- ✓ 120A Output: Handles the highest diagnostic loads.
- ✓ Connected: Custom charging curves via USB.
- ✓ 5-Meter Reach: High-gauge cables included.
- ✓ Flexible Voltage: Works on 85V-265V power.
4 Operating Modes
Diag+ (Diagnostic)
Delivers up to 120 Amps to sustain vehicle electronics during diagnostic work and ECU reprogramming. The voltage can be precisely adjusted (12V to 14.8V) to meet specific OEM requirements.
Charging
Provides an advanced charging cycle for 12V Lead-Acid and Lithium (LiFePO4 & Li-ion) batteries from 20 to 1500 Ah. Ensures a 100% charge while protecting battery health.
Showroom Mode
Compensates for current drain when using electrical accessories (lights, infotainment, windows) in a demonstration vehicle, keeping the battery in optimal condition.
Tester Mode
Allows you to check the battery voltage, evaluate the starting system (starter + battery), and assess the condition of the vehicle’s alternator.
USB Connectivity
Import custom charging profiles, download history files for analysis, and connect external modules (such as a printer or barcode reader) via the USB port.
Heavy Duty Build
Built with a robust casing, shock-absorbing pads, and IP21 protection. The fan-less design (in specific modes) prevents dust ingress, ensuring longevity in workshop environments.
Technical Specifications
| Power Output | 120 Amps |
| Voltage | 12 V |
| Cable Length | 5 Meters (25mm² gauge) |
| Battery Capacity | 20 – 1500 Ah |
| Input Voltage | 85V – 265V AC (Flexible Voltage) |
| IP Rating | IP21 |
| Dimensions | 31 x 13 x 26 cm |
| Weight | 6.5 kg (Unit) / ~8.5 kg (With Cables) |
Advanced Safety & Reliability
The GYSFLASH 125.12 CNT FV offers top-tier protection for onboard electronics and the operator:
- • Short circuits protection
- • Polarity reversal protection
- • Overload protection
- • Thermal runaway sensor
Cable Calibration: Automatically detects cable length and cross-section to adjust voltage delivery, ensuring the voltage at the clamps is exactly what you set at the machine.
Package Includes: GYSFLASH 125.12 CNT FV Unit, 5m Heavy Duty Charging Cables (25mm²), Wall Fixing Brackets, User Manual.
GYSflash 125.12 Charger Cnt FV 5M Cables Knowledgebase
Why is 120A output necessary for ECU programming?
It prevents voltage drop. Modern vehicles, especially BMWs and Mercedes, can draw over 80-100 Amps when the ignition is on but the engine is off. The 120A output ensures the voltage stays perfectly stable at your setpoint (e.g., 14.2V), preventing the ECU flash from failing—a critical safety standard for Mobile Eco Tuning.
What does "CNT" stand for in the model name?
It stands for "Connected" technology. This unit features a USB port that allows you to connect it to a computer to download charge history, update firmware, or upload custom charging profiles. You can even connect accessories like a barcode scanner or printer directly to the unit.
Can I use this on Lithium (LiFePO4) batteries?
Yes, it has a specific Lithium mode. The charger detects the chemistry and applies a specialized 9-step charging curve designed for Lithium Iron Phosphate (LFP) batteries, ensuring they are charged safely without risking thermal runaway.
What is the advantage of the "FV" (Flexible Voltage) feature?
It works on unstable power grids. The "Flexible Voltage" input allows the charger to operate perfectly on mains voltage ranging anywhere from 85V to 265V. This is ideal if you are using long extension leads in a workshop which might otherwise cause voltage drop and shut down lesser chargers.
Why should I buy this GYS unit from Mobile Eco Tuning (MET)?
We use this exact tool daily. At our company, Mobile Eco Tuning, we do not perform a single remap without a GYS unit attached. We know it works, we hold UK stock for Next Day Delivery, and we can support you if you have technical questions.
Does it fit underneath a vehicle?
Yes, it is designed for this. The unit is only 13cm high, allowing it to slide easily under most vehicles. This keeps your showroom or workshop floor tidy and prevents trip hazards while the car is being worked on.
What is "Showroom Mode"?
A safe, silent maintenance mode. It supplies current to the vehicle's electrical accessories (lights, screens) while keeping the battery fully charged. Crucially, it has a "Lock" feature to prevent customers or staff from accidentally changing settings while the car is on display.
Can I calibrate the cables if I shorten or extend them?
Yes, cable calibration is built-in. If you decide to change the included 5m cables for a different length or thickness, the GYSFLASH allows you to recalibrate the unit to account for the resistance change, ensuring the voltage at the clamps remains precise.
Will it automatically restart after a power cut?
Yes, it has an Auto-Restart function. If the mains power fails, the charger remembers the last settings and automatically resumes exactly where it left off once power is restored. This provides peace of mind during long overnight charging sessions.
Is it safe to leave connected for long periods?
Absolutely. It is designed for unattended use. The intelligent charging curve tapers off to a maintenance "float" charge, so you can leave it connected to a vehicle for weeks or months without overcharging or damaging the battery.
Can I customize the voltage output for specific manufacturers?
Yes, in Diag+ mode. You can manually adjust the stabilized voltage output (typically between 12V and 14.8V) to meet specific manufacturer requirements. For example, some brands require exactly 13.8V during coding, which you can dial in precisely.
Does it have a fan, and is it loud?
It is fan-cooled but efficient. It uses active cooling to handle the massive 120A output. However, because it uses inverter technology, it is much more efficient and quieter than older heavy transformer-based chargers, making it suitable for workshop environments.
Can it recover a deeply discharged battery?
Yes, it has an SOS Recovery mode. It can attempt to recover batteries that have discharged down to as low as 2V. The charger pulses current to break down sulfation and restore the battery's capacity if it isn't physically damaged.
Are the 5m cables detachable?
Yes, they use heavy-duty connectors. The cables plug into the front of the unit using robust quick-connect fittings. This makes it easy to replace them if they get damaged or swap them for different clamp types without opening the machine.
Does this replace a standard workshop battery tester?
It has a "Tester" mode built-in. While it's primarily a charger, it can check the battery voltage, evaluate the starting system (starter motor draw), and test the alternator output, giving you a quick health check before you start working.
Can I pickup a Gys GYSFlash 125 12 Charger Cnt Fv 5M Cables near me?
Yes. If Gys GYSFlash 125 12 Charger Cnt Fv 5M Cables is showing in stock, it is available for collection from our Weston Super Mare store on the same day before 5pm. Next day UK delivery is also available as well as global delivery. Visit https://shop.mobileecotuning.com/shipping for more details
For further technical enquiries, please visit Mobile Eco Tuning.
| Weight | 6 kg |
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| Brand |
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