Comparison · Batteries

Vapcell K40 21700 4000mAh 30A/45A or LiitoKala Lii-40A 21700 4000mAh

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: LiitoKala Lii-40A 21700 4000mAh (4074 mAh vs. 4049); Energy: LiitoKala Lii-40A 21700 4000mAh (14.972 Wh vs. 14.71).

Model	Vapcell K40 21700 4000mAh 30A/45A2021Read review →	LiitoKala Lii-40A 21700 4000mAh2018Read review →
Voltage, V	3.6	3.7
Current, A	30	40
Capacity, mAh	4049	4074
Test current, A	30	30
Energy, Wh	14.71	14.972
Temperature rise, °C	90	90
Review conclusion	Recommended	With reservations

Only in one review: Capacity at high current 4041 mAh (LiitoKala Lii-40A 21700 4000mAh).

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.

LiitoKala Lii-40A 21700 4000mAh: Capacity meets the rating, but the claimed continuous discharge current is questionable.

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.