Comparison · Batteries

33140 15Ah LiFePO4 cell or Samsung INR18650-20S

Two models side by side: measurements taken by the author in their reviews, and their conclusions. The better value in each row is highlighted.

In brief: Based on review measurements: Test current: 33140 15Ah LiFePO4 cell (40 A vs. 30); Resistance: 33140 15Ah LiFePO4 cell (2.25 mΩ vs. 7.5).

Model	33140 15Ah LiFePO4 cell2024Read review →	Samsung INR18650-20S2019Read review →
Current, A	30	30
Test current, A	40	30
Resistance, mΩ	2.25	7.5
Review conclusion	With reservations	Recommended

Only in one review: Voltage 3.2 V (33140 15Ah LiFePO4 cell); Temperature rise 84 °C (Samsung INR18650-20S); Weight 270 g (33140 15Ah LiFePO4 cell).

33140 15Ah LiFePO4 cell: Capacity is close to the rating, but its behavior at 40 A puzzled the author, who recommends staying at 0.5–1C.

Samsung INR18650-20S: At 30 A it reached only 84°C; the author notes it often costs less than the VTC4.

Figures were taken from the review text and checked against the quoted passages. Measurement conditions differ between reviews, so read the reviews yourself before buying. Prices at the time of review.