Comparison · Batteries

Vapcell N40 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: Vapcell K40 21700 4000mAh 30A/45A (30 A vs. 10).

Model	Vapcell N402023Read review →	Vapcell K40 21700 4000mAh 30A/45A2021Read review →
Voltage, V	3.6	3.6
Current, A	10	30
Capacity, mAh	4000	4049
Test current, A	10	30
Review conclusion	Recommended	Recommended

Only in one review: Energy 14.71 Wh (Vapcell K40 21700 4000mAh 30A/45A); Resistance 15 mΩ (Vapcell N40); Temperature rise 90 °C (Vapcell K40 21700 4000mAh 30A/45A); Weight 48 g (Vapcell N40).

Vapcell N40: Genuine 4000 mAh cells with excellent consistency, though the author advises against using them at high currents.

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.