Mastervolt MLI Ultra 1250 Lithium Battery

Mastervolt MLI Ultra 12/1250

Heavy Duty, Extreme Performance
The MLI series deliver extreme Lithium Ion performance even under the harshest conditions, such as high charge and discharge currents, wet environments, mechanical shocks or vibrations. This is realized by combining our best Lithium-Iron Phosphate (LiFePO4) cells with a proprietary Battery Management System (BMS) inside a sturdy, waterproof housing.

The sophisticated Mastervolt BMS ensures optimal use of each individual cell. Integrated battery monitoring provides you with accurate and up-to-date information on the state of your battery. Integrated NMEA2000, CZone and MasterBus communication allows complete system integration, to ensure the best possible charging, while maximizing the lifetime of your battery.

Self-learning balancing algorithm
The MLI Ultra batteries are equipped with a self-learning balancing algorithm that predicts the behavior of each individual battery cell and balances proactively, resulting in a faster and more efficient charge cycle. The self-learning system eliminates unnecessary stress on the cells, resulting in an even longer Battery Cycle Life.
 

Freezing cold weather performance
The MLI Ultra 1250 comes with integrated thermal heat-pad and sophisticated low-temperature control to ensure maximum charging performance at freezing temperatures. In cold weathers it uses the connected charger to power the heat-pad and keep the battery cell temperatures above freezing point. This assures the fastest possible charging and full power capabilities even on the coldest days.
 

Integrated battery switch
The integrated battery safety switch disconnects the battery cells in case of abnormalities. This is based on smart algorithms analyzing all details of the battery condition such as charge current, temperature, cell details and more. Where other integrated switches have current limitations, the MLI Ultra 1250 will keep providing energy up to 200 Amps continuously.
 

Plug-and-play by Auto Configuration
Installing a Lithium Ion battery has never been easier.  Wire the MLI Ultra 1250 to any supported Mastervolt charger, connect the communication cable and the battery automatically fully configures the charger to match the battery. In this way a smooth and worry-free charging experience is ensured without the need of any configuration tools.

Key features
Ultimate performance, Heavy duty Lithium Ion batteries.
BMS and LiFePO4 chemistry according to highest safety standards.
Drop-in replacement for size Group 31 and Group 49 (85-90 Ah) batteries.
More than three times the life span of traditional batteries.
Saves up to 70 % in space and weight.
High charge / discharge rate up to 2 C.
Fast charging within 60 minutes.
Series connection up to 48V possible.
Integrated battery switch
Integrated thermal heat-pad with control
Integrated battery monitoring (Voltage, Current, State of Charge, Time Remaining).
MasterBus communication with any Mastervolt Battery Charger or Smart Remote.
CZone and NMEA2000 compatible.
Fully waterproof.
UN 38.3, CE, E-Mark and FCC certified
Compliant to UL1973 and RVIA standards, TEI listed.
MLI Ultra 12/1250

Product code: 66011250

Specifications

General specifications
Nominal battery voltage 
12 V
Nominal battery capacity 
100 Ah
Nominal battery energy capacity 
1250 Wh
Cycle life 
3500 cycles at 80 % DOD at 25 °C, max. C3 charge and C2 discharge
Max. charge current 
100 A
Recommended charge current 
= 50 A
Max. continuous discharge current 
200 A
Continuous charge current 
100 A
Peak discharge current 
500 A (10 sec.)
Battery monitoring 
integrated
MasterBus communication 
yes
CZone / NMEA 2000 communication 
yes
Terminals 
M8
Mounting position 
upright (recommended) or either long side
Dimensions 
yes
Max. outer dimensions (incl. terminals/grip handles), lxwxh 
330 x 173 x 210 mm
13.0 x 6.8 x 8.3 inch
Product weight 
15 kg
33.1 lb
Shipping weight 
17,2 kg
37.9 lb
Compliance 
CE, E-Mark, UL1642 (cells only), FCC, RVIA compliant
 
Technical specifications
Battery chemistry 
Lithium Iron Phosphate
Protection degree 
IP65
Parallel connection 
yes, unlimited
Series connection 
yes, up to 48 V
Protections 
over voltage, under voltage, over temperature
Safety relay 
integrated
Safety relay controls 
integrated