U2 or Vapcell S4 plus

In brief: Based on review measurements: Test current: Vapcell S4 plus (3 A vs. 2.3).

Model	U2Vapcell · 2022Read review →	Vapcell S4 plus2020Read review →
Current, A	2	3
Test current, A	2.3	3
Review conclusion	With reservations	With reservations

Only in one review: Voltage 12 V (Vapcell S4 plus); Temperature rise 72 °C (Vapcell S4 plus); Weight 330 g (Vapcell S4 plus); Price 13.39 $ (U2).

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

Vapcell S4 plus: Charges and measures capacity well, but lacks LiFePO4 support and recharges very slowly after a test at 250 mA.

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.

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