Is it worth upgrading from AGM to Lithium batteries?

Please take a moment to watch the video below for step-by-step guidance, or follow the step-by-step written directions.

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1. Understand the Two Battery Types

• AGM (Absorbed Glass Mat): An upgraded version of traditional lead-acid batteries

• Lithium (LiFePO4): A newer, different battery chemistry (lithium iron phosphate)

• Both store power and will work—but they behave differently.

2. Compare Charging Speed

• Lithium: Charges very fast and can handle a lot of power at once

• AGM: Charges slower, especially when nearing full

• If you use solar panels, lithium makes better use of limited sunlight.

3. Consider Cold Weather Performance

• Lithium:

  • Cannot charge below 32°F (0°C)

  • Can still discharge (use power) in the cold

• AGM:

  • Can charge even in freezing temperatures

  • May lose some capacity over time in cold conditions

4. Understand Voltage Behavior

• AGM:

  • Voltage reflects charge level

  • ~12.6V = full

  • ~12.0V = empty

• Lithium:

  • Voltage stays almost the same from 100% down to ~20%

  • Requires a battery monitor (shunt) to track charge accurately

5. Compare Lifespan

• AGM: Typically lasts 2–4 years

• Lithium: Can last 10+ years (about 3–5× longer)

6. Look at Cost vs Value

• AGM: Lower upfront cost

• Lithium: Higher upfront cost, but longer lifespan = better long-term value

7. Choose Based on Your Needs

• Pick Lithium if you want:

  • Faster charging

  • Longer lifespan

  • Better solar performance

• Pick AGM if you want:

  • Lower upfront cost

  • Simplicity

  • Reliable charging in cold weather