Mastervolt MLI Ultra 12/2500
The Mastervolt MLI Ultra 12/2500 is a battery pack with a nominal voltage of 12V, a rated capacity of 180Ah, 2.5kWh of energy, a continuous discharge of 500 A and a weight of 30 kg.
Last updated: 26 October 2026
Battery and charging
- Energy
- 2.5kWh
- Voltage
- 12V
- Rated capacity
- 180Ah
- Maximum continuous discharge
- 500A
- Recommended continuous discharge
- 60A
- Peak instantaneous discharge
- < 1800A
- Recommended charging
- 60A
- Highest charge current it will take
- 500A
- Charging voltage
- 14.25V
- Float voltage
- 13.5V
- Voltage it cuts off at
- 10V
- How fast it loses charge sitting idle
- < 4% per month @ 20 ºC
“Nominal energy 2.5kWh 5kWh 5kWh”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Nominal voltage 12V 12V 24V”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Nominal capacity (Cn) 180Ah 360Ah 180Ah”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Maximum charge/ discharge current 500A 500A 500A”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Recommended charge/ discharge current 60A 120A 60A”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Pulse current (10 sec) < 1800A < 1800A < 1800A”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Recommended charge/ discharge current 60A 120A 60A”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Maximum charge/ discharge current 500A 500A 500A”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Adjust charge characteristic of the IUoUo characteristic as follows: Li-Ion battery model Bulk / absorption voltage setting Float voltage setting MLI Ultra 12/2500 14.25V 13.5V MLI Ultra 12/5000 14.25V 13.5V MLI Ultra 24/5000 28.5V 27.0V”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Adjust charge characteristic of the IUoUo characteristic as follows: Li-Ion battery model Bulk / absorption voltage setting Float voltage setting MLI Ultra 12/2500 14.25V 13.5V MLI Ultra 12/5000 14.25V 13.5V MLI Ultra 24/5000 28.5V 27.0V”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Discharge cut off voltage*** 10V 10V 20V”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Self-discharge < 4% per month @ 20 ºC”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
Battery care and safety
- Charge cycles the battery lasts
- ~ 3500 @ 80% DOD
- Operating temperature range
- –25 to 50 ºC / –13 to 122 ºF
- Temperatures it may be stored in
- –25 to 50 ºC / –13 to 122 ºF
“Cycle life ~ 3500 @ 80% DOD ~ 3500 @ 80% DOD ~ 3500 @ 80% DOD”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Operating temperature** –25 to 50 ºC / –13 to 122 ºF”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Storage temperature –25 to 50 ºC / –13 to 122 ºF”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
Size and fit
- Weight
- 30 kg
- Terminals
- Bolts M8
“Approximate weight 30 kg (128 lbs) 58 kg (128 lbs) 58 kg (128 lbs)”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
“Terminal type Bolts M8 Bolts M8 Bolts M8”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
Identity
- Item code, from the manufacturer's product data
- 66012500
“Part number 66012500 66015000 66025000”
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
Sources
- Archived document
Source: chmarine.com/content/Mastervolt/MV66015000_User Manual.pdf
Retrieved October 13, 2026