Comparison · Batteries

Samsung INR 18650-20S or Panasonic NCR18500A

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: Capacity: Samsung INR 18650-20S (2021 mAh vs. 2000); Test current: Samsung INR 18650-20S (30 A vs. 3.8).

Model	Samsung INR 18650-20S2019Read review →	Panasonic NCR18500A2016Read review →
Capacity, mAh	2021	2000
Test current, A	30	3.8
Review conclusion	Recommended	Recommended

Only in one review: Voltage 4.2 V (Panasonic NCR18500A); Capacity at high current 1990 mAh (Samsung INR 18650-20S); Energy 6.815 Wh (Samsung INR 18650-20S); Resistance 7 mΩ (Samsung INR 18650-20S); Temperature rise 84 °C (Samsung INR 18650-20S); Price 19.59 $ (Panasonic NCR18500A).

Samsung INR 18650-20S: The high-current cell delivered well with modest heating, and the author unequivocally recommends it.

Panasonic NCR18500A: Both cells delivered nearly 2000 mAh in the standard test, exceeding the stated capacity.

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.