Which battery should I choose for an electric motor?

March 2, 2026

🔋 Which battery should I choose for an electric motor?

Choosing the right battery matters more than many people think when using an electric motor on a boat.

The wrong battery can result in:

Here, I’ll go through what to look for so you can put together a setup that works reliably in practice.

An electric motor can draw a lot of current, especially under heavy load.

That’s why it’s important to choose a battery that:

✔ can deliver high current
✔ maintains a stable voltage
✔ can withstand many charge cycles

Otherwise, the motor quickly loses efficiency.

Both types can be used, but they perform differently.

AGM battery

Lithium (LiFePO4)

That’s why many people choose lithium for electric motors.

Voltage makes a big difference.

The higher the voltage, the lower the current for the same power—and that means smaller cables and lower losses.

Even the best battery won’t help if the cables are too small.

Cables that are too thin cause:

It depends on:

As a rule of thumb:

✔ a larger battery = longer run time
✔ lithium provides the most usable energy per kg

Can I use a regular leisure battery?
Yes, but it often results in shorter run time and lower performance.

Is lithium better for an electric motor?
Yes, most people experience longer run time and more consistent power.

Why is my motor losing power?
This is often due to low voltage or cables that are too small.

If you’re unsure what’s right for your electric motor, feel free to send me:

Then I’ll help you find the right solution.

✔ longer time on the water
✔ more power
✔ less voltage drop
✔ more stable operation