Comparison · Chargers

U2 or Used QC 3.0 charger

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: Test current: Used QC 3.0 charger (8 A vs. 2.3); Price: Used QC 3.0 charger (3.4 $ vs. 13.39).

Model	U2Vapcell · 2022Read review →	Used QC 3.0 charger2018Read review →
Current, A	2	8
Test current, A	2.3	8
Price, $	13.39	3.4
Review conclusion	With reservations	With reservations

Only in one review: Voltage 5 V (Used QC 3.0 charger); Power 40 W (Used QC 3.0 charger); Ripple 200 mV (Used QC 3.0 charger); Weight 123 g (Used QC 3.0 charger).

U2: Supports four battery types and charging up to 2 A, but has current spikes and may overcharge LiFePO4 after a power interruption.

Used QC 3.0 charger: The used charger delivered the rated 8 A on 5 V, but QC is faulty and ripple under load is high.

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.