LiFePO4 vs NMC in portable power stations: what the cycle numbers mean

Almost every portable power station sold today lists a lithium iron phosphate battery, and spec pages lead with a cycle count — 3,000, 4,000, 6,000. Those counts are only comparable when you know what each maker means by the end of a cycle life. This guide explains the two chemistries in plain terms, shows how the cycle figures are defined, and lists every station in our data with its chemistry and rating.

What LiFePO4 and NMC are

Both are lithium-ion batteries. The name describes the material of the positive electrode (cathode). LiFePO4 — lithium iron phosphate, often printed as LFP — uses iron phosphate. NMC — lithium nickel manganese cobalt oxide, sometimes written NCM — uses a mixed oxide of those three metals. Everything else in a power station (inverter, cooling, battery management, firmware) is separate from the cell chemistry, and it shapes the product as much as the cells do.

This page does not attach performance or safety properties to either chemistry. What it can do is show what the makers publish for each station, side by side, and point out where the published numbers are not measuring the same thing.

How makers state cycle life

A cycle rating has two parts: a number of charge–discharge cycles, and the share of original capacity the battery still holds after them. Makers choose different thresholds:

• Jackery: “4000 cycles to 70%+ capacity” (Explorer 1000 v2 spec page).
• EcoFlow: “4000 cycles to 80+% capacity” (DELTA 3 spec page).

Same count, different promise. Applied to the capacities on our cards, the Explorer 1000 v2 (1,070 Wh) is rated to keep at least 70 % — about 749 Wh — after 4,000 cycles, while the DELTA 3 (1,024 Wh) is rated to keep at least 80 % — about 819 Wh — after the same count.

Conditions differ too. Goal Zero states the LiFePO4 Yeti 1500's 4,000 cycles as “To 80% of original capacity at 25 °C with a 0.5C charge and discharge” (Goal Zero Yeti 1500 page), and the NMC Yeti 1500X's 500 cycles at “Discharge rate: 1C, Full charge/discharge, Temp: 25C” (Goal Zero Yeti 1500X page). EcoFlow's FAQ for the DELTA Pro 3 also quotes 0.5C/0.5C at 25 °C. The C-rate expresses current relative to capacity, so 1C is twice the current of 0.5C. A rating earned at one rate is not directly comparable with one earned at another, and most cycle figures on our cards come with no rate at all.

Every station in our data

Sorted by end-of-life threshold, then by maker. Weight per Wh appears only where the maker publishes both figures. Click a model for its sources.

Weights are as the makers print them; a few cards note conflicts on the same page (the Bluetti AC180 page gives both 35.27 lb and 37 lb, the Jackery Explorer 1000 Plus page both 32 lb and 24 lb). The Jackery Explorer 1000 v2 page itself gives two capacities, 1,070 Wh and 1,024 Wh; the table uses the US spec block.

The NMC units: Yeti 1500X and DELTA Max (2000)

Goal Zero sells two stations of almost the same capacity side by side, which makes the clearest comparison in our data. The older Yeti 1500X lists “Cell chemistry: Li-ion NMC”, 1,516 Wh and 500 cycles to 80 %. The newer Yeti 1500 lists LiFePO4, 1,505.28 Wh and 4,000 cycles to 80 %. Both are rated at 2,000 W continuous.

• Cycle rating: 500 vs 4,000 to the same 80 % threshold — though at different stated rates (1C for the 1500X, 0.5C for the 1500).
• Weight: 45.64 lb vs 52.75 lb, so the NMC unit stores more energy per pound here.
• Charging: the 1500X takes 14 hours on its included 120 W power supply, 7 hours on the optional 230 W supply and 3 hours on the optional 600 W supply (Goal Zero); the Yeti 1500 lists 1.1 hours to full on AC fast charge.
• Warranty: 2 years vs 5 years on the cards.

The second NMC record is the EcoFlow DELTA Max (2000). Its manual lists “Cell Chemistry NCM” and 800 cycles to 80 % — from the 230 V edition, the only spec table we found. The US model is under recall: CPSC notice 26-010 says “The Power Stations may overheat and ignite, posing a risk of serious burn injury and fire hazard”, and the remedy is a free firmware update (CPSC recall 26-010). The notice does not name the cell chemistry as the cause, and neither do we.

The same applies to Goal Zero's YETI 3000X, which is not in our model data: its recall notice says “The recalled power station's circuit board can overheat, posing a risk of serious injury from fire and burn hazards” (CPSC recall 26-712). With two NMC records, one of them recalled and missing a weight, the data supports no general statement about either chemistry beyond what each maker prints.

What “not published” means

A blank on our card means the maker's page did not state the figure when we read it. It is not a zero, and it is not a guess waiting to be filled in. In the table:

• The DELTA 3 Classic, DELTA 3 Max and DELTA 3 Max Plus pages name LFP cells but print no cycle figure; the Classic's pages only say “10 years of reliable power”.
• The DARAN R100 says “3,500+ cycle lifespan” without a capacity threshold, so it cannot be placed next to the 70 % or 80 % figures.
• The MARBERO M82 page states neither chemistry nor cycles.
• The Anker SOLIX C1000 Gen 2's US page does not name its chemistry; the card takes LiFePO4 from Anker's Australian page.
• jackery.com calls the current Jackery Explorer 300 a “New version” with LiFePO4 cells; earlier units sold under the same name may differ, so check that a listing says LiFePO4.

How to use the cycle figure

Group stations by threshold before comparing counts: 4,000 to 70 % and 3,000 to 80 % are not ranked by subtraction. Within a threshold, a higher count is the maker's longer promise. Then put it next to how you will use the unit. A cycle is a full charge and discharge, so a station that sits charged for outages and is drained a few times a year uses few of its rated cycles; one drained and refilled from solar every day uses one per day. For calendar terms, the warranty on the card is the maker's commitment in years. The full rule we apply is on the methodology page.