Battery Overview

Our ambition is to make Li-ion Battery Technology affordable and the technology of choice.

Todays battery efficiency highly depends on the chemical composition but also on the weight to energy ratio. This especially on vessels, as reduced weight means less drag which again means less energy consumed by the propulsion. Our batteries are now close to 30% lighter than the average systems commonly used in the marine industry.

During the process of becoming a leader of electric propulsion in the marine industry we realised that we couldn’t find the right batteries at the right price. Hence we are now developing and producing battery systems ourselves. We are only using the finest materials available. Proudly we realise that the big three german car manufacturers are starting to share our view.

12 V / 24 V / 48 V Batteries

  • The batteries are efficient, scalable and perfectly fitted for the marine industry.

HV / High Energy Power Packs

HV Battery
  • All New Li-NMC (Nickel Manganese Cobalt) cells provide more power, lighter weight, smaller size and 25% more range than last year’s LiFePo4 chemistry.

Solid State Technology Batteries

  • Cycle Life of more than 10´000 easily achievable
  • Outstanding safety record


  • Container 10 ft
  • Container 20 ft
  • Safe and Reliable power supply

Custom Design Battery

If you don’t find the right dimensions of the batteries, EPT can make you a custom designed battery for your specific need. Ask us for a quote, we understand that the batteries should fit the vessel and not the other way around.

Origin of the Battery Materials

Lithium92% Australia, 8% China
NickelPapua New Guinea
CobaltPapua New Guinea

Battery comparison chart

Electrical Characteristics12 VDC24 VDC48 VDCHV / High EnergySolid State Technology
Chemistry LFPNMCNMCNMCLithium-ion
Nominal Voltage12.8 VDC 150A25.6V 109A51.2V 52A88.8V factor of51.2V factor of
Energy2.0kWh2.8kWh2.8kWh15.7kWh factor of14.336kWh factor of
Cycle Life2500 @ 80% DoD2600 @ 80% DoD2600 @ 80% DoD2600 @ 80% DoD10’000 @ 80% DoD
Voltage2 in series is possible to get 24V, unlimited parallel2 in series is possible to get 48V, unlimited parallel2 in series is possible to get 96V, unlimited parallel10 in series, 24 in parallel16 in series, 24 in parallel

Standard Charge12 VCD24 VDC24 VDCHV / High EnergySolid State Technology
Max Continues Charge60A60A30A1C0.8C
Max Charge70A70A35A1.5C for 15 min1.2C for 15 min

Standard Discharge12 VDC24 VDC 48 VDCHV / High EnergySolid State Technology
Max Continues Discharge120A120A120A1.6C1.2C
Peak Discharge200A<1S200A<1S200A<1S2 C for 15min, 3 C 10sec @ 25°C2 C for 10min, 3 C 10sec @ 25°C

Environmental12 VDC24 VDC48 VDCHV / High EnergySolid State Technology
Temp Range-10°C to 50°C-10°C to 45°C-10°C to 45°C-10°C to 45°C-10°C to 50°C
Ideal Working Temperature5°C to 45°C5°C to 40°C5°C to 40°C5°C to 40°C5℃ to 45℃

Mechanical12 VDC24 VDC48 VDCHV / High EnergySolid State Technology
Battery CaseStainless SteelStainless SteelStainless SteelALU / SS top coverALU / SS top cover
Dimensions (LWH) mm300 x 420 x 115 mm300 x 420 x 115 mm300 x 420 x 115 mm1090 x 425 x 147 mm810 x 425 x 250 mm
System MountRacking SystemRacking SystemRacking SystemSelf-Stackable or RackSelf-Stackable or Rack
Weight21 kg21 kg21 kg82kg 102kg
Communication modeCAN bus 250kCAN bus 250kCAN bus 250kCAN bus 250kCAN bus 250k
IP RatingIP 54IP 54IP 54IP 65, IP 67 on requestIP 65, IP 67 on request
CertificationsCE, UN38.3CE, UN38.3CE, UN38.3CE, UN 38.3, DNV-GL pendingCE, UN 38.3, DNV-GL pending
General Warranty2 Years, 3 years an option2 Years, 3 years an option2 Years, 3 years an option2 Years, 3 years an option2 Years, 3 years an option
Cycle life Warranty5 Years5 Years5 Years5 Years5 Years

We have done extensive testing in order to make sure that the batteries can keep up with the forces of nature

Catalog Lithium Batteries

Our partners and ourselves makes battery packs continuously cleaner by utilising the complete value of Lithium-Ion Cell-Technology. This by producing better designed packs and by developing smarter solutions resulting in a lower total cost of ownership for our customers. Our R&D, Engenieering and Production Departments are aligned in the efforts to create the best quality and competitive battery modules and packs with the full insight in the behaviour of the Li-ion Cell.

As we are continuously working on the optimisation of the Cycle-life it lowers the costs of service as the operational reliability increases and optimises the LCA (optimal Cycle-life and intelligent use of materials). For this matter EPT teamed up with the ‘best in class’ partners. For BMS (battery management system) and Cell design, we also have close partnerships and are involved in the design level of the components.