Electric outboard batteries – safe, powerful & waterproof

The ePropulsion electric outboard batteries are designed for high performance and the harsh marine environment. Cleaner, energy efficient power, the lithium batteries range from 1 kWh to 144 kWh to complement our industry leading electric outboards.

High version battery

Spirit battery

WH battery

E Series batteries

High version battery

Spirit 1.0 Plus battery 1kWh


E 40 – E Series battery 2kWh

Size: 42 x 39 x 20.7 cm
16.5 × 15.4 × 8.2 inches


E80 – E Series battery 4kWh

Size: 55.5 × 44 × 21.2 cm
21.9 × 17.3 × 8.4 inches

large battery

E175 – E Series battery 9kWh

Size: 50 × 56.5 × 27.7 cm
19.7 × 22.2 × 10.9 inches

Spirit 1.0 Plus Integrated Battery

Battery Capacity: 1276 Wh – extensive capacity
Battery weight: 8.7kg
Rechargeable: 12 volt auxiliary output or solar panel
Regenerative charging: Yes – with Spirit 1.0 Evo

Charging time:
Standard 8.5 hours
Fast Charger 3.5 hours
Battery life: 500 cycles @ 80% DOD
Waterproof: IP67
Recyclable: Yes
Buoyant: will float if you drop it overboard
E series battery compatible

E Series batteries

Battery Capacity:
E40 – 2048Wh
E80 – 4096 Wh
E175 – 8960Wh

Battery weight:
E40 – 28kg
E80 – 48kg
E175 – 87kg

Rechargeable: 12 volt auxiliary output or solar panel
Regenerative charging: Yes – with Navy Evo & POD drives
Charging time:
110V: E40 2hrs, E80 4 hrs, E175 4.5 hrs (2 chargers)/2 hrs (1 charger)
220V: E40 2hrs, E80 3 hrs, E175 3 hrs (2 chargers)/ 6hrs (1 charger)
Battery life: 3000 cycles @ 80% DOD
Waterproof: IP67
Recyclable: Yes
Parallel connection: Yes – up to 16

Maintenance free

Plug, play and charge


80% less weight than acid or agm battery


Waterproof and shockproof

Space saving

75% less volume than acid or agm battery


Inherently safe chemistry. BMS protection


Recycling and redistribution is easy

Change to electric powered outboards – clean, efficient performance

All ePropulsion batteries are designed for maximum efficiency, performance and safety. The batteries will discharge themselves and hibernate when not in use to protect themselves, so there is no need for any manual discharging.

The affordable lithium E Series batteries are compact and energy dense and weigh 75% less than the equivalent lead acid battery. It is possible to use a 3rd party lead acid battery with the ePropulsion range, although the ePropulsion motor will not be able to access real time battery status. In addition, the E-Series batteries are designed to achieve the most efficient unit price on the market, as low as $0.46 per WattHour.

The Spirit 1.0 Plus and 1.0 Evo electric outboard motors can be connected to the E Series batteries for longer range use, instead of using the integrated electric outboard battery.

Multiple E Series batteries of the same size can be connected in parallel, to increase power output. Each has a different battery management system and cell configuration, hence only the same model can be connected in parallel.