LiFePO4 vs NMC power stations: what the chemistry changes, in the makers' own numbers

Every power station sold for home backup since about 2023 is built on lithium iron phosphate, and the ones sold before it were mostly not. The difference is real but it is not the one the marketing implies, and the cleanest way to see it is a maker that sells both: Jackery’s original Explorer 1000 and its Explorer 1000 v2 are near-identical products separated mainly by the cells inside.

Two units, one maker, one number changed

Spec (Jackery’s pages, read September 10, 2026)	Explorer 1000 (original)	Explorer 1000 v2
Chemistry, as stated	“Lithium-ion”	LiFePO4
Capacity	1,002 Wh	1,070 Wh
AC output	1,000 W, 2,000 W surge	1,500 W, 3,000 W surge
Weight	22.04 lb	about 23.8 lb
Cycle rating	800 cycles to 80%+	4,000 cycles to 70%+

Five times the cycles for an extra two pounds, at similar capacity. That is the trade in one row, and it is why the entire category switched. It also shows the fine print this site prints on every card: the two ratings are not to the same basis, 80% for the old unit and 70% for the new, so the honest comparison is “many times more cycles,” not “five times.”

What the chemistry actually changes

Cycle life. Iron phosphate cells tolerate full charges and deep discharges far better than nickel-cobalt cells. Makers rate LFP power stations at 3,000 to 6,000 cycles: EcoFlow at 3,000 or 4,000 to 80% depending on the model, Anker at 4,000 to 80%, Bluetti at 6,000 to 80% on its newest units. NMC units were rated at 500 to 800. For a unit cycled daily on solar the difference is a decade versus two years; for one that runs three storms a year it barely matters, and the lifespan guide explains which clock a backup unit actually runs on.

Weight. NMC stores more energy per pound. On the two Jackerys the gap is two pounds; across the market an LFP unit is typically 10 to 20% heavier for the same capacity. That is the price of the cycle life, and for a unit that is carried to a campsite it is a real one.

Heat tolerance. Iron phosphate cells are harder to push into thermal runaway than NMC cells, which is a large part of why makers adopted them for products that sit in closets and basements. It is a property of the cell chemistry, and it is not the same as a safety certification; the UL listings this site prints on every card are earned by the finished product, not by the chemistry.

Cold. Both chemistries lose usable capacity in the cold and neither should be charged below freezing; most units refuse to. Every maker’s capacity rating is at room temperature. A unit in an unheated garage should be sized with margin regardless of which cells it uses, as the usable capacity guide explains.

How to read the spec sheet

Three lines settle most of it. The chemistry line should say LiFePO4 or LFP; “lithium-ion” without a qualifier means it is probably not. The cycle rating should state a basis, “to 80% capacity”; a bare “3,000+ cycles” is a number without a promise, and on our cards it reads as not stated rather than being rounded up. And the certification line should name a listing, UL 2743 for portable units or UL 9540 for home systems, because the chemistry does not confer one. The refrigerator and sump pump pages show what that looks like on real units, including the ones where the maker states none.

What does not change

The runtime math. A watt-hour is a watt-hour, the inverter loses the same 15% turning it into AC, and the surge question depends on the inverter, not the cells. Chemistry decides how many years the unit lasts and how much it weighs; it does not decide whether it starts your pump.