Battery chemistry & storage

LFP vs NMC cycle life comparison

Enter how deep you cycle your battery, how often, and how hot it runs. Get a side-by-side cycle life and years-of-service estimate for LFP and NMC.

Your numbers

1 Project details Optional
Shown on your exported report. Leave blank to skip.
2 Your usage pattern
How much of the battery's capacity you use before recharging, on a typical day.
Daily cycling is 7. Backup-only use is often under 1.
3 Your environment
Where the battery actually sits: garage, closet, or outdoor enclosure, not just your local climate.
4 Battery specs Optional
Check your specific manufacturer's datasheet. Leave blank to use the 6,000-cycle industry default.
Leave blank to use the 2,500-cycle industry default.

How it works

Three steps to a cycle life comparison

Step 1

Find your typical depth of discharge

Check how much of the battery you actually use before recharging on a normal day. If you're not sure, the depth of discharge tool explains why this number matters more than most people expect.

Step 2

Estimate your cycling frequency and operating temperature

Daily solar cycling is 7 cycles a week. Backup-only systems are often under 1. Pick the temperature range for where the battery actually sits, not just your regional climate.

Step 3

Compare adjusted cycle life against your budget

Once you have both estimates, run the cost per kWh comparison to see whether the chemistry with more cycles actually saves money over your ownership window.

Understanding your cycle life comparison

How LFP and NMC actually differ

LFP is rated for around 6,000 cycles to 80% capacity at 80% depth of discharge, roughly double or more the 2,500-cycle rating typical of NMC under the same conditions. LFP also runs cooler and resists thermal runaway better, which is why most new home battery systems have shifted toward it. NMC still shows up where weight and physical size matter more, like some electric vehicles and portable equipment, a tradeoff covered further in the EV battery degradation vs home battery comparison.

Why depth of discharge changes the math so much

Every cycle to a shallower depth of discharge puts less mechanical and chemical stress on the cell, so the battery can deliver more total cycles before capacity fades to 80%. Cutting depth of discharge from 100% to 50% roughly doubles the number of cycles a cell delivers, a relationship NREL's energy storage research has confirmed as one of the strongest levers in cycle life testing, which is why the degradation vs usage pattern calculator treats this as the single biggest lever a homeowner controls directly.

How temperature accelerates or slows aging

Lithium cell aging roughly follows an Arrhenius curve, meaning degradation speed roughly doubles for every 18°F (10°C) rise above 77°F (25°C). A battery bank in a hot uninsulated garage ages meaningfully faster than the same bank in a conditioned utility closet. The temperature derate calculator and cold weather capacity loss calculator cover the low-temperature side of this same relationship.

What this means for your total cost

A chemistry with a longer cycle life needs replacing less often, which matters more the longer you plan to own the system. Run your own comparison result through the total cost of ownership comparison to see the full picture across purchase price, replacement timing, and cycles delivered, and check the savings with battery vs without battery tool to make sure the underlying investment still pencils out either way.

What to check next

Once you know roughly how many years each chemistry buys you, the replacement timing tool lines that figure up against a real calendar, and the safety certification comparison covers the other major factor buyers weigh alongside lifespan. This same cycle-life comparison question comes up at grid scale, where the DOE's Office of Electricity evaluates chemistry tradeoffs for long-duration storage projects.

Questions

Frequently asked

LFP is typically rated for around 6,000 cycles to 80% capacity at 80% depth of discharge, while NMC is typically rated for around 2,500 cycles under the same conditions. For a battery cycled once a day at 80% depth of discharge in a moderate climate, that works out to roughly 16.5 years for LFP versus roughly 6.9 years for NMC.

Yes. Cycling to 50% depth of discharge instead of 100% can roughly double the number of cycles a battery delivers before it fades to 80% capacity, since each cycle stresses the cell less. A battery cycled at 50% depth of discharge instead of full discharge often lasts close to twice as many cycles.

Both chemistries lose cycle life faster in heat, roughly halving for every 18°F (10°C) above 77°F (25°C) of average operating temperature. This calculator applies that same temperature effect equally to both chemistries, so heat changes each chemistry's cycle life by the same proportion rather than shifting the LFP-to-NMC ratio. A battery bank in a hot garage regularly above 95°F can lose close to half its rated cycle life compared to one in a conditioned space.

LFP usually costs more upfront per kWh but needs replacing far less often, so it's typically cheaper over a 15 to 20 year ownership window for daily-cycling systems. The battery chemistry cost per kWh comparison and total cost of ownership comparison tools run the full math for your own numbers.

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