The Mastervolt MLI Ultra 12/1250 is a battery pack with a nominal voltage of 12 V, a rated capacity of 100 Ah, 1250 Wh of energy, Lithium Iron Phosphate cells, a continuous discharge of 200 A, a peak of 500 A (10 sec.) and 3500 cycles.
Last updated: 8 October 2026
Battery and charging
- Energy
- 1250 Wh
- Voltage
- 12 V
- Rated capacity
- 100 Ah
- Chemistry
- Lithium Iron Phosphate
- Rated charge cycles
- 3500 cycles at 80 % DOD at 25 ⁰C, max. C/3 charge and C/2 discharge
- Maximum continuous discharge
- 200 A
- Peak discharge
- 500 A (10 sec.)
- Recommended charging
- ≤ 50 A
- Highest charge current it will take
- 100 A
“Nominal battery energy capacity 1250 Wh”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Nominal battery voltage 12 V”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Nominal battery capacity 100 Ah”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Battery chemistry Lithium Iron Phosphate”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Cycle life 3500 cycles at 80 % DOD at 25 ⁰C, max. C/3 charge and C/2 discharge”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Max. continuous discharge current 200 A”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Peak discharge current 500 A (10 sec.)”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Recommended charge current ≤ 50 A”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Maximum continuous charge current 100 A”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
Battery care and safety
- Ingress protection
- IP65
“Protection degree IP65”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
Size and fit
- Overall dimensions
- 330 x 173 x 210 mm 13.0 x 6.8 x 8.3 inch
- Terminals
- M8
- Stated weight
- 15 kg 33.1 lb
- Which way up it may be fitted
- upright (recommended) or either long side
- Series and parallel connection
- yes, up to 48 V
“Max. outer dimensions (incl. terminals/grip handles), lxwxh 330 x 173 x 210 mm 13.0 x 6.8 x 8.3 inch”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Terminals M8”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Product weight 15 kg 33.1 lb”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Mounting position upright (recommended) or either long side”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Series connection yes, up to 48 V”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
Other findings
- Allowed max charge current
- 100 A
- Parallel connection
- yes, unlimited
- Safety relay
- integrated
“Max. charge current 100 A”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Parallel connection yes, unlimited”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
“Safety relay integrated”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
Certification claims
- Product compliance claim
- CE, E-Mark, UL1642 (cells only), FCC, RVIA compliant
“Compliance CE, E-Mark, UL1642 (cells only), FCC, RVIA compliant”
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
Sources
- Archived document
Source: mastervolt.com/products/li-ion/mli-ultra-12-1250
Retrieved October 8, 2026