MASTERVOLT MLI Ultra 1250 12V/100Ah Lithium Pack

Only 1 in stock
SVB price: €2,126.01
Excl. VAT, excl. shipping costs.
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€2,126.01 This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
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Image of MLI Ultra 1250 12 V / 100 Ah Lithium Charger/Inverter Combo Pack

MASTERVOLT MLI Ultra 1250 12 V / 100 Ah Lithium Charger/Inverter Combo Pack

Maximum operational reliability in perfect balance with this set from MASTERVOLT - future-oriented lithium technology that you can rely on. The MASTERVOLT MLI Ultra is a lithium power pack with a capacity of 100 Ah (at a voltage of 12 V). With LiFePO4 chemistry...

Item no.
MASTERVOLT lithium 12V 100A set incl. SmartRemote and Chargemaster 12V/35A
Device type
Network AC voltage
80 - 275 V
Battery nominal voltage
12 V
Charging Current
35 A
Charging outputs
Battery Capacity
140 - 350 Ah
Battery type
Lithium (LifePO4)
Power Lead
Integrated fan
Integrated charging cable
Temperature sensor can be connected
Optional remote display/operation
21 cm
29.1 cm
10.5 cm
2.5 kg
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Product details


MASTERVOLT MLI Ultra 1250 Lithium Battery

Plus ChargeMaster 12/35-3 & SmartRemote


Maximum operational reliability in perfect balance with this set from MASTERVOLT - future-oriented lithium technology that you can rely on. The MASTERVOLT MLI Ultra is a lithium power pack with a capacity of 100 Ah (at a voltage of 12 V). With LiFePO4 chemistry and high-tech BMS, MASTERVOLT guarantees the best possible standards in terms of safety, whilst maintaining the high quality the company is known for.


The advantages of MLI Ultra 1250 lithium technology

  • High safety standards thanks to LiFePO4 chemistry and integrated high tech Battery Management System (BMS).
  • Significantly higher life cycle compared to conventional lead-acid batteries.
  • Heavy duty, extreme performance with a discharge rate of up to 2 C (max. 200 A for 3-5 minutes at ≥ 25°C)
  • Perfect for use as a starter battery, for bow thrusters or consumers.
  • Fast charging thanks to high charging currents of up to 0.5 C (50A)
  • Integrated MasterBus interface for complete NMEA2000 network compatibility
  • Sophisticated low-temperature control and integrated thermal heat pad to ensure maximum charging performance even when temperatures drop below freezing
  • Series connection of up to 4 MLI Ultra 12/1250 possible / 2 MLI Ultra 24/1250 (max. 48 V)
  • Integrated battery switch - disconnects battery cells in case of abnormalities for maximum safety
  • Similar in size to comparable acid-lead, AGM or GEL batteries
  • Low weight - just 15 kg

The Perfect Match

In combination with a MASTERVOLT Chargemaster battery charger, not only do you benefit from maximum performance, but also the highest possible safety for your lithium system. Using the MasterBus interface to connect your MASTERVOLT MLI 1250 Ultra and a Chargemaster battery charger is the best way to charge your battery and increase its life span at the same time. When the MLI Ultra and Chargemaster charger are connected via the MasterBus interface, the charger can automatically apply the best settings for the battery in real time depending on the current situation.
Installing a lithium-ion battery has never been easier. Hook up your MLI Ultra 1250 to the MASTERVOLT Chargemaster Plus charger and connect the two units using the MasterBus interface and the charger is automatically configured with the optimal settings for the battery, making your charging experience hassle-free and without the need for configuration tools.
Thanks to the NMEA2000 interface (micro-C connector), the MASTERVOLT MLI litihum battery can be quickly and easily integrated into an existing NMEA2000 network. With compatible devices, you can retrieve data from the battery at any time.

View a range of information on the SmartRemote display via the MASTERVOLT Chargemaster Plus using the MasterBus interface. Display key parameters, such as current supply, the power of the charger, as well as the voltage and temperature of the connected batteries.

MLI System



Chargemaster Plus 12/35-3

ChargeMaster Plus can handle all possible mains voltages and frequencies worldwide. The battery chargers can resist large voltage fluctuations and high temperatures, making them suitable for the harshest environments - perfect for use on boats and in cars. ChargeMaster PLUS units comply with CE, E-mark, ABYC, UL, SAE, CEC and RCM/C-Tick standards.

ChargeMaster PLUS chargers are self-explanatory! They display the charging phase of all three outputs in an easy to understand way. Robust and ergonomic connections save installation time.

In modern applications, all components work hand in hand. The CAN-based MasterBus allows the charger to communicate with displays, shunts and power systems, including communication standards such as CZone, NMEA and CANopen. The ChargeMaster PLUS can operate as a power supply for sensitive communication equipment or during the construction phase of a boat.

Everything in View

SmartRemote Display

Checking your batteries, adjusting your shore fuse or controlling your Mastervolt charger/inverter has never been easier. The display communicates with the MASTERVOLT ChargeMaster Plus & CombiMaster devices, shows key parameters and allows simple device settings.
With its attractive design and compact size, the SmartRemote is thus ideal as a remote control panel in smaller systems and works as a local device display in larger systems.


  • Full colour display for local device monitoring
  • Displays four key parameters
  • Control key device functions
  • CZone and MasterBus network compatible
  • Universal, easy mounting
  • Plug & Play – no configuration, no power supply needed


Technical Data

MASTERVOLT MLI 1250 Lithium Battery
Specifications / technical data
General specifications
Battery chemistry Lithium Iron Phosphate, LiFePO4
System voltage 12 V 24 V
Nominal voltage 12.5 V 25 V
Capacity 100 Ah 50 Ah
1250 Wh
Cycles 3500 cycles at 80 % DOD at 25 ⁰C
Self-discharge < 3 % / month
Parallel / series connection Battery banks (clusters) can be assembled from up to 2 or 4 identical batteries,
system voltage max. 48 V.
Mixing 12 or 24 V MLI Ultras is not permitted.
Parallel / series connection with lead-acid types is not permitted!
Charge / discharge
Charge characteristic 3-stage CCCV (IUoUo)
Max. Charging voltage (Bulk/Absorption) 14.25 V 28.5 V
Final charging voltage (Float) 13.5 V 27 V
Max. Cont. charging current 100 A (1 C) 50 A (1 C)
Recommended charging current ≤ 50 A (0.5 C) ≤ 25 A (0.5 C)
Continuous discharge current 100 A (1 C) 50 A (1 C)
Max. discharge current
3-5 minutes at ≥ 25°C
200 A (2 C) 100 A (2 C)
Peak discharge current
10-15 seconds at ≥ 25°C
500 A (5 C) 250 A (5 C)
Discharge cut-off voltage
(temperature > 0°C, discharge current < 1 C)
10 V 20 V
Operating conditions
Nominal operating temperature 25 °C
Operating temperature range -20 to 50 °C
Note on temperature during charging If a charger is connected and the battery temperature is below 0 °C, the internal heater switches on until 5 °C is reached or the charger is disconnected.
It takes about an hour for the battery to warm up from -20 °C to above 0 °C.
Charging at temperatures < 5 °C may result in the battery not being charged, and the charging current being used to heat the cells first.
Temperatures below 5 °C and above 25 °C can affect the service life and the number of charging cycles.
Storage temperature -20 to 55 °C
Relative humidity 10 to 95, non-condensing
Battery monitoring / BMS Integrated
(Safety) disconnect switch Integrated, also can be switched manually
MasterBus-connection Yes
MasterBus power supply option Yes
CZone / N2k compatibility Yes
Waterproofing IP65
Certification CE, E mark
Mechanical properties
Battery connection M8 threaded blind holes or conical SAE car battery pole adapters (included)
Installation position upright (recommended)
or lying on the longest side
Dimensions LxWxH
without / with car battery pole adapters and carrying handle
330 x 173 x 210 / 228 mm
Weight: 15 kg / 33 lbs
Connections M8 threaded blind holes or
conical DIN/EN car battery terminal adapters, tightening torque 14.7 - 19.6 Nm
Installation position Upright (recommended) or
lying on the longest side

  • All MASTERVOLT lithium batteries are designed to stop charging by themselves!
    The BMS sends a "Stop Charge" command, which switches off the connected MASTERVOLT charging technology (chargers, DC/DC charging converters or alternator high-power regulators) via a MasterBus connection. Each lithium battery and charging source must be configured via USB interface (optional accessory) and MasterAdjust software.
  • The "Stop Charge" command must be executed directly!
    For charging technology not from MASTERVOLT (alternators, shore power chargers, solar regulators, wind generators, etc.), a powerful relay must be provided as an option, which is controlled via the AUX line (included in the delivery) and interrupts the connection between the charging source and the lithium battery. (Even when using third-party charging technology, configuration and "Stop Charge" function control should be carried out via USB interface and MasterAdjust software).
  • The MLI Ultra is supplied ready for use in a MasterBus network or as a stand-alone battery.
    For CZone and for advanced functions, the settings must be adjusted. Most settings can be adjusted via DIP switches.
    Advanced or network settings are configured via a Windows laptop or notebook, using either an optional USB interface and the free MasterAdjust software or the CZone configuration tool/programme. The MasterAdjust software is available free of charge at under downloads.
  • The MLI Ultra records the following historical data: The number of charge cycles, when the last (100%) full charge occurred, the total capacity used and the lowest and highest battery voltage.

MASTERVOLT ChargeMaster Plus 12/35-3
ChargeMaster PLUS 12/35-3
Nominal output voltage (output 1,2 & 3) 12 V
Number of battery outputs 3
Charging current in total 35 A at 14.25 V
Recommended battery capacity (total) 140 - 350 Ah
Nominal input voltage 120/240 V, 50/60 Hz
Max. AC current (230 V / 120 V) 2.5 A / 5 A
Mains/power supply mode Yes
Display LED
Dimensions HxWxD 291 x 210 x 105 mm
Weight: 2.5 kg
Certifications CE, CEC, DOE, ABYC, UL1236, cULus, SAE J1171, ISO 8846, ACMA
Charge characteristic IUoUo, automatic with pre-float / 3-stage for lead acid/gel/AGM/lithium-ion
Temperature compensation (only for lead acid types) -30 mV/°C, temperature sensor included
Voltage compensation Yes, via MasterShunt
DC power consumption < 2 mA (MasterBus off)
Current control function via MasterBus or CZone
Power factor control Yes, > 0.98
Temperature range (ambient temp.) -25 to +80 °C
Cooling Vario fan
Waterproofing IP 23
Protection systems Overtemperature, overload, short circuit, high/low battery voltage, spark protection
MasterBus compatibility Yes

Display 2.8" (7.1 cm)
Resolution 320 x 240 px (high colour)
power consumption Bus powered (<160 mW)
Interfaces CZone, MasterBus
Installation Panel mount (Ø 52 mm)
Waterproof IP20
Dimensions (h x w x d) 72 x 72 x 29.4 mm
Weight: 0.075 kg
Included in delivery MasterBus cable (6 m), Mastervolt-CZone drop cable (1 m), manual


en-flag Safety datasheet
PDF, 426,68 KB
en-flag Short manual
PDF, 460,21 KB
multi-flag Manual
PDF, 2,34 MB
multi-flag Manual
PDF, 1,27 MB

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MASTERVOLT lithium 12V 100A set incl. SmartRemote and Chargemaster 12V/35A
MASTERVOLT Lithium 12V 100A Set incl. Easyview 5 and CombiMaster 12/2000-60
21 cm
28.4 cm
29.1 cm
37.1 cm
Charging Current
35 A
60 A
10.5 cm
15.5 cm
2.5 kg
6.9 kg
Network AC voltage
80 - 275 V
170 - 280 V
Device type
Charger/inverter combined
Charging outputs
Battery Capacity
140 - 350 Ah
180 - 500 Ah
230 V
Continous Power
1600 W
12 V
Peak power
2400 W
AC connection
Availability / Price
Only 1 in stock
only €2.126 01
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only €2.889 87
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