Ultra Lithium MLI Battery 12 V 1.25 kWh

The Mastervolt MLI Ultra Lithium 12/1250 battery has a nominal capacity of 100 Ah and a nominal energy of 1250 Wh (1.25 kWh). It is designed to provide significant power for your marine applications.

The MLI Ultra 12/1250 battery uses Lithium Iron Phosphate (LiFePO4) technology. This chemistry is recognized for its safety, long lifespan, and robustness, even under demanding conditions.

The Mastervolt MLI Ultra 12/1250 battery weighs 15 kg (33.1 lbs). This reduced weight, compared to traditional batteries, allows for space and weight savings of up to 70%.

Yes, the MLI Ultra 12/1250 battery is fully waterproof and has an IP65 protection rating. This means it is protected against dust and low-pressure water jets, making it ideal for marine environments.

The MLI Ultra 12/1250 battery is designed to provide 3,500 cycles at an ambient temperature of 25 °C and a depth of discharge (DoD) set at 80 %.

The MLI Ultra 12/1250’s advanced BMS ensures optimal use of each individual cell via a predictive self-balancing algorithm. This system provides:

Faster and more efficient charging cycles.Extended battery lifespan.Protection against overvoltage, undervoltage, overcurrent, and overheating.An integrated safety switch that disconnects cells in case of anomalies.

Yes. The MLI Ultra 12/1250 LiFePO4 battery includes an integrated thermal heating pad and intelligent low-temperature control. If the battery temperature drops below 0 °C and a charger is connected, the internal heater activates to maintain cell temperature above freezing (up to 5 °C), enabling optimal charging even in cold conditions.

Yes, the MLI Ultra 12/1250 battery is designed as a direct replacement for traditional Group 31 and Group 49 (85-90 Ah) lead-acid batteries, delivering superior performance and a lifespan more than three times longer.

The dimensions of the MLI Ultra 12/1250 battery (with terminals and handles) are 330 x 173 x 210 mm (Length x Width x Height).

The packaging of the MLI Ultra 12/1250 battery includes the following items:

1x MLI Ultra battery2x flat washers2x spring washers2x M8 bolts for battery terminal2x M8 Allen bolts for battery terminal1x thick positive automotive battery terminal1x thin negative automotive battery terminal1x MasterBus connector1x MasterBus cable (1 m)1x CZone interconnect cable (1 m)1x 6-pin auxiliary cable (2 m)2x mounting clamps1x removable handle1x quick installation manual

You can secure the MLI Ultra 12/1250 battery in several ways:

With the mounting clamps (included) for fixed applications.With a long-side retention system (suitable for battery group size 49).In a rack or tray.

For the MLI Ultra 12/1250 battery, a recommended fuse is 200 A (IR 10 kA). It is imperative to use an MRBF fuse holder and mount it directly on the positive terminal of the battery. The installation process is as follows:

Mount an MRBF fuse holder directly on the positive terminal of the battery.Add the fuse.Add the positive cable.Add a flat washer, then a spring washer.Tighten the bolt to the recommended torque.Connect the negative cable to the negative terminal.Never install a fuse directly on the battery terminal without an insulated fuse holder.

The recommended torque for the M8 terminal bolts on the MLI Ultra 12/1250 battery is 14.7 to 19.6 Nm (130 to 170 in lb).

For the MLI Ultra 12/1250 battery, the recommended cable diameters are 70 mm² (AWG 2/0).

The MLI Ultra 12/1250 battery is equipped with a battery switch (safety disconnect):

To turn it off: Press the button for 1 second. LED C (green) will flash.To turn it on: Press the button for 5 seconds. LED C (green) will remain lit for 1 minute.To check status: Press the button briefly. LED C will indicate the status (solid for 'on', flashing for 'off').If the battery was manually turned off, it must be manually turned back on.

Yes, the MLI Ultra 12/1250 battery can be charged with any lithium-ion compatible battery charger. It is crucial to ensure the charger matches the MLI Ultra’s charging parameters. You must set the battery type to 'MLI' or configure the 3-step+ (also called luoUo) charge profile as follows:

Absorption charge voltage (max. charge): 14.25 VFloat voltage (end of charge): 13.5 V

Yes, the MLI Ultra 12/1250 battery allows parallel and series connections:

Parallel connection: There is no limit to the number of batteries that can be connected in parallel.Series connection: Batteries can be connected in series up to a 48 V system.

The MLI Ultra 12/1250 battery is compatible with several communication systems for complete system integration:

MasterBus: For communication with Mastervolt battery chargers and smart remote controls.CZone: Enables integration into a CZone network.NMEA 2000: Compatible with NMEA 2000 networks for monitoring and control.It also offers a 'plug-and-play' function with automatic configuration with compatible Mastervolt chargers.

Advanced Systems Group provides a two-year product warranty on the MLI Ultra Lithium 12/1250 battery, starting from the purchase date. This warranty is valid provided the product is installed and used in accordance with the manual instructions.