45A 12V→12V Compact DC-DC Battery-to-Battery Charger
Higher-output compact charger delivering up to 45A to a 12V auxiliary battery from a 12V source. Perfect for larger leisure batteries or faster charging on the move, with advanced protections for safe, unattended operation.
Key features
- Adaptive multi-stage charging for Flooded/AGM/GEL, LiFePO4 and Lithium-ion (NCM).
- DIP-switch battery profile selection; D+ ignition start/stop and source-voltage sensing control.
- Full electronic protections; continues charging while loads are in use.
- Optional temperature sensor, Bluetooth module and remote LCD meter.
- Safe unattended charging: the unit features inbuilt safety functions (protection against overload, overheating, overvoltage, over-discharge, short circuit, and reverse discharge of the battery), that allow the charger to be left permanently connected to the batteries for unattended automatic charging.
- Advanced temperature protection and compensation: when paired with an optional external temperature sensor (sold separately), the charger provides advanced temperature protection for Lead Acid batteries. The battery will be charged at varying voltages to compensate for voltage loss during temperature changes.
- Data monitoring: the charger includes ports for a remote meter or a Bluetooth module (both sold separately), allowing data to be viewed on an LCD display or through a mobile phone app when connected.
- Continued charging during battery/load use: the charger will continue to operate at full power whilst energy is drawn from the battery during use. Any 12V loads may also be left permanently connected and running whilst the DC-to-DC charger is in operation, and will be protected against overvoltage and voltage fluctuations.
- Ignition on/off control: via connection to the ignition control through the D+ terminal, this charger can be set to begin battery-to-battery charging immediately when vehicle ignition is turned on, and stop charging when the vehicle is turned off.
- Wake-up function for Lithium batteries: when the Battery Management System (BMS) of a lithium battery goes into the protection mode, the charger can automatically activate the BMS and continue charging the lithium battery.
Technical specifications
| Source battery voltage | 12V |
| Input voltage range | 10.5 - 16V |
| Effective D+ signal range | 8 - 16V |
| Max charging current (target) | 45A |
| Max charging power | ≈585W |
| Recommended source battery | ≥60Ah |
| Target battery capacity | 80 - 400Ah |
| Target battery operating voltage range | 8 - 16V |
| Bulk voltage | AGM 14.7V, GEL 14.3V, Flooded 14.4V, LiFePO4 14.4V, Li-ion 12.6V |
| Float voltage | AGM 13.5V, GEL 13.8V, Flooded 13.5V, LiFePO4 13.8V, Li-ion 12.5V |
| Temperature compensation | -3mV/°C/2V |
| Operating temperature | -20°C to +50°C |
| Self-consumption | ≈17mA |
| Dimensions (L×W×H) | 147 × 156 × 41 mm |
| Weight | ≈0.72 kg |
| Warranty | 1 year |
Compatibility & installation
12V systems only. Follow recommended cable sizing and protection. D+ input recommended for ignition-controlled start/stop.
Optional accessories
- Temperature sensor, Bluetooth module, remote LCD meter.
Documents available
Installation & user guide available for download.