Electric Boat Battery Lifespan

One of the most common questions: how long will my electric boat battery last? Here's the complete breakdown.

Battery Types & Lifespan

Type	Cycles	Years	Cost/kWh
Lead-Acid	300-500	3-5 years	$150
Lithium-Ion (NMC)	2,000-3,000	8-15 years	$800
LFP (LiFePO4)	3,000-5,000	10-20 years	$500
Solid-State (NEW)	5,000+	15-25 years	$1,500

What Affects Battery Life?

• Depth of discharge: Keep between 20-80% for best longevity
• Charging speed: Fast charging generates heat = faster degradation
• Temperature: Extreme cold/hot speeds up aging
• Storage: Store at 50% charge if not using for months

When to Replace?

When capacity drops below 70% of original. A 100kWh battery that now only holds 70kWh should be replaced.

Warranty

Most marine batteries come with 5-10 year warranties. Premium brands like Torqeedo offer up to 10 years or 3,000 cycles.