Comparison · Batteries

EVE 21700 40P 4Ah or Vapcell K40 21700 4000mAh 30A/45A

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: Vapcell K40 21700 4000mAh 30A/45A (4049 mAh vs. 4000); Test current: EVE 21700 40P 4Ah (35 A vs. 30).

Model	EVE 21700 40P 4Ah2026Read review →	Vapcell K40 21700 4000mAh 30A/45A2021Read review →
Current, A	50	30
Capacity, mAh	4000	4049
Test current, A	35	30
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); Temperature rise 90 °C (Vapcell K40 21700 4000mAh 30A/45A).

EVE 21700 40P 4Ah: The cells delivered their rated capacity but exceeded 100°C at 35 A; the author considers 25–30 A a safer continuous current.

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.

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.