The VCC 1212-70 CI from Votronic (MPN: 3362) is a fully automatic 12V-to-12V B2B (battery-to-battery) charging converter designed to optimally charge onboard and service batteries while driving. It was developed specifically for motorhomes, specialty vehicles, and boats, and ensures reliable, battery-friendly charging even in modern Euro 6 vehicles with regulated alternators. It supports lead-acid, gel, AGM, and LiFePO4 batteries.
Efficient Battery Charging
12 V to 12 V B2B charging converter with up to 70 A charging current
Suitable for LiFePO4, AGM, gel, and lead-acid batteries
Specially developed for vehicles with smart or Euro 6 alternators
Multi-stage IUoU charging curves for battery-friendly charging
Adjustable charging programs for various battery technologies
Integrated temperature compensation for lead-acid batteries
LiFePO4 protection functions, including temperature monitoring
Automatic activation via D+, ignition, or voltage-controlled
Trickle charging of the starter battery at up to 5 A
Connections for remote control, display, VBS2, and CI-Bus
Temperature sensor included
Optimal charging even with modern alternators
Many modern vehicles reduce the alternator’s charging voltage to save fuel and reduce emissions. As a result, the auxiliary battery is often no longer fully charged. The converter compensates for these fluctuations, converts the input voltage into a stable charging voltage, and charges the vehicle battery using a charging curve tailored to the battery type. This ensures that the available battery capacity is utilized more effectively, even on short trips.
Suitable for various battery technologies
The charging converter supports various battery types and features several selectable charging programs. In addition to traditional lead-acid, gel, and AGM batteries, modern LiFePO4 batteries can also be charged safely. For lithium batteries, the device takes into account the requirements of an existing battery management system (BMS) and offers special protective functions, including protection against charging at impermissibly low temperatures. An included temperature sensor also enables temperature monitoring of the onboard battery.
Gentle Charging and High Reliability
The multi-stage IUoU charging algorithm first ensures rapid main charging, followed by a full charge and trickle charging. Loads connected in parallel are supplied directly during the charging process without negatively affecting the charging process. At the same time, the integrated reverse current block prevents the starter battery from discharging during idle operation. Another advantage is the integrated trickle charging of the starter battery. If additional energy is available, the VCC 1212-70 CI can support the starter battery with a trickle current of up to 5 A, thereby compensating for its self-discharge.
Flexible Activation and Extensive Connection Options
Charging can be initiated automatically via the alternator’s D+ signal, via the ignition, or via voltage control. Additionally, connections are available for sensor wires for voltage measurement, remote controls, the LCD Charge Control S, the LED Remote Control S, and the Votronic CI-Bus or VBS2. This allows the charge converter to be easily integrated into and monitored within the existing onboard electrical system.
Technical Specifications
Device Type: B2B Charge Converter (Battery-to-Battery)
Input voltage: 12 V
Output voltage: 12 V
Maximum charging current: 70 A
Adjustable charging current: 0–70 A
Recommended battery capacity: 100–460 Ah
Maximum battery capacity: up to 620 Ah
Starter battery maintenance: 0–5 A
Input voltage range: 10.5–16.5 V
Supported battery types:
Lead-acid
Gel
AGM
LiFePO4
Charging Method: IUoU Characteristic Curve
Automatic activation via D+, ignition, or voltage
Temperature compensation for lead-acid batteries
LiFePO4 protection function
Sensor connections for input and output voltage
Connections for remote control, display, VBS2, and CI-Bus
Operating temperature: -20 °C to +45 °C
Dimensions (L × W × H): 234 × 139 × 74 mm
Weight: approx. 1.3 kg
Package Contents
Votronic VCC 1212-70 CI B2B charging converter
2x temperature sensors
Installation and Operating Instructions
