Sailing independently doesn't just mean knowing how to steer or anchor: it also means learning to manage your resources, day after day. Electricity on board has a major impact on safety (VHF, AIS, autopilot), comfort (refrigeration, lighting, computer and telephone charging) and even fresh water, if you have a watermaker.
On land, you plug in an extension cord. At sea, we count our amperes.
The choice of battery type is therefore neither technical nor anecdotal . It's a strategic decision that will affect your peace of mind for months to come. Should you switch to lithium, or stick with lead? This guide will help you make up your mind.
Why this subject is essential
Because the fridge doesn't run on candles, and neither does the remote school computer.
Energy autonomy on a sailboat is anything but a luxury. Whether you're living at anchor, alternating between sailing and stopovers, or planning a transatlantic crossing, your onboard energy will be a key factor in your project.
And choosing your battery park is often the most important thing in life at the heart of this equation : capacity, recharging, consumption, weight, safety, lifespan... and budget.
Understanding the key differences
Weight âeuros Capacity âeuros Service life âeuros Depth of discharge
| Criteria | Lead-acid batteries | Lithium batteries |
| ?? Weight | Heavy | Very light |
| ? Discharge depth | 50% max recommended | Up to 80-90% |
| âtm "ï¸ Life cycles | 500 to 1000 cycles | 2000 to 5000 cycles |
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