Li-ion vs LiPo for FPV: When Each Chemistry Wins

Both store lithium, both power quads, and they fail at each other's jobs. The difference comes down to two numbers pulling in opposite directions.

The two numbers that decide everything

Energy density (Wh/kg). Li-ion cells store roughly 240-260 Wh/kg; FPV LiPo packs sit closer to 140-170 Wh/kg. Gram for gram, Li-ion carries about 50% more energy.
Current delivery. A quality LiPo shrugs off 60-100+ A bursts. A typical 18650/21700 Li-ion cell tops out at 10-35 A continuous depending on the cell, and its voltage sags hard the closer you push it to that ceiling.

Everything else - flight time, throttle feel, punch-outs - follows from those two facts.

What that means in the air

LiPo holds voltage under punch-outs, so throttle response stays crisp at full send. It tolerates freestyle abuse and racing current spikes. The price: more weight per Wh, and it hates deep discharge.

Li-ion cruises. On a low-throttle long-range build pulling 5-15 A, the sag never bites, and the extra Wh/kg converts directly into minutes. Push a Li-ion pack like a freestyle pack and voltage collapses - the quad feels mushy, then the low-voltage alarm ends the party early.

Estimate the difference for your own setup with the flight time calculator - enter the same AUW with a LiPo's and a Li-ion's capacity and compare.

Quick decision table

Your flying	Chemistry	Why
Freestyle, bando ripping	LiPo	Burst current, crisp throttle
Racing	LiPo (often LiHV)	Maximum punch, sag tolerance
Long range 7"+ cruising	Li-ion (21700)	1.5x the Wh per gram
Cinematic slow flying	Either	Current is low; pick by weight
Whoops / micros	LiPo (1S HV)	Tiny cells, high relative current

Practical notes before you switch

C-rating vs cell spec. LiPo marketing C-ratings are optimistic tiers, not guarantees - see the truth about C-ratings. Li-ion cells publish honest continuous-current specs; believe them.
Check your current draw first. Our quad pages list a typical cruise current estimate; the current draw calculator shows what your pack must sustain. Below ~15 A per pack, Li-ion becomes interesting; above it, stay LiPo.
Storage is where LiPo dies. LiPo left full degrades in weeks; Li-ion tolerates storage far better. See LiPo care.
Voltage math differs. A "6S" Li-ion runs 25.2 V down to ~15 V (2.5 V/cell), much deeper than a LiPo's comfortable ~21 V (3.5 V/cell) floor - flight timers and alarms need re-tuning.

Browse packs by chemistry, cells and capacity in the batteries hub - every entry lists weight, capacity and price per Wh so the density trade-off is visible directly.