Comparison · Batteries

Vapcell K40 21700 4000mAh 30A/45A or Molicel INR21700-P42A

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: Molicel INR21700-P42A (4060 mAh vs. 4049); Test current: Molicel INR21700-P42A (36 A vs. 30).

Model	Vapcell K40 21700 4000mAh 30A/45A2021Read review →	Molicel INR21700-P42A2019Read review →
Current, A	30	45
Capacity, mAh	4049	4060
Test current, A	30	36
Review conclusion	Recommended	Recommended

Only in one review: Voltage 3.6 V (Vapcell K40 21700 4000mAh 30A/45A); Capacity at high current 3900 mAh (Molicel INR21700-P42A); Energy 14.71 Wh (Vapcell K40 21700 4000mAh 30A/45A); Temperature rise 90 °C (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.

Molicel INR21700-P42A: It delivered 4060 mAh at 0.2C; above 10 A the Samsung falls noticeably behind.

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.