Comparison · Batteries

Vapcell K40 21700 4000mAh 30A/45A or Samsung INR21700-40T

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 INR21700-40T (4200 mAh vs. 4049); Test current: Samsung INR21700-40T (37 A vs. 30); Temperature rise: Vapcell K40 21700 4000mAh 30A/45A (90 °C vs. 100).

Model	Vapcell K40 21700 4000mAh 30A/45A2021Read review →	Samsung INR21700-40T2019Read review →
Current, A	30	35
Capacity, mAh	4049	4200
Test current, A	30	37
Temperature rise, °C	90	100
Review conclusion	Recommended	Recommended

Only in one review: Voltage 3.6 V (Vapcell K40 21700 4000mAh 30A/45A); Energy 14.71 Wh (Vapcell K40 21700 4000mAh 30A/45A).

Vapcell K40 21700 4000mAh 30A/45A: The author identifies it as a rewrapped Samsung INR21700-40T and praises its output and consistency, though the price is a drawback.

Samsung INR21700-40T: The cell sustains 30–35 A, handles 40 A briefly, and is well suited to power-tool packs.

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.