Fishing for a Reason

55: Should You Switch to Lithium Batteries on Your Boat? Here's What You Need to Know

Jamie Propst Season 1 Episode 55

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0:00 | 22:18

If you've been thinking about swapping out your old lead acid batteries for lithium — but you're not sure if it's worth the money or if they're even safe — this episode is for you. Scott walks through his real-world experience after two years running lithium phosphate batteries on his boat, covering the pros, the cons, the gear you'll need, and the mistakes to avoid.

In This Episode:

  • Why lithium batteries are far safer than the lithium batteries that gave the technology a bad name
  • How lithium nearly doubles your usable capacity at half the weight
  • The charger, inverter, and DC-to-DC changes you may need to make
  • Why some outboard manufacturers (like Yamaha) say not to connect lithium directly — and how to work around it
  • How the battery management system app lets you monitor charge state and troubleshoot electrical draws in real time
  • Scott's honest two-year review running EPOCH lithium batteries on his boat

Timestamps:

00:00 – Introduction and Seattle Boat Show recap 
01:30 – Anglers Unlimited Gold community update and PSA scholarship announcement 
03:30 – North of Falcon salmon season setting preview 
04:15 – Lithium battery safety: Why LiFePO4 is different from old lithium tech 
06:00 – Pros: Capacity, weight savings, and consistent 14-volt output 
08:30 – Cycle life and warranty 
09:30 – Cost comparison: Lithium vs. Lead acid 
10:00 – Charger upgrades: Why your old charger won't cut it 
11:30 – Inverter compatibility and brand options 
12:30 – The outboard question: Direct connection vs. DC-to-DC charger 
16:00 – Dual-purpose batteries and cold cranking amps 
17:30 – Charging best practices: The 20–80% rule 
18:30 – The battery management app and real-world monitoring 
20:30 – Scott's two-year honest review and final thoughts

Key Takeaways:

  • Lithium phosphate batteries nearly double your usable capacity at roughly half the weight of lead acid.
  • They maintain above 14 volts all the way down — no more anxious voltage watching on long anchor days.
  • Budget around $400 per battery versus $200 for lead acid, but factor in the 11-year warranty and 3,500+ cycle lifespan.
  • Check your outboard manufacturer's stance before connecting lithium directly — a DC-to-DC charger is the safest route for most setups.
  • Your old trickle charger won't work — lithium batteries need a compatible charger that can deliver 30+ amps for bulk charging.
  • The battery management app is a game changer for monitoring charge state and tracking down mystery electrical draws.
  • Keep batteries between 20–80% charge for maximum longevity — and you don't need to leave them plugged in when stored.

Resources & Links:

Want structured courses, expert seminars, fishing maps, and a community that helps you catch more fish? Join the waitlist for Anglers Unlimited Gold membership at https://anglersunlimited.co/gold