USB DC-DC board, type two or 5 V UPS

In brief: Based on review measurements: Ripple: 5 V UPS (100 mV vs. 110).

Model	USB DC-DC board, type two2019Read review →	5 V UPS2019Read review →
Voltage, V	5	5
Current, A	3	2
Test current, A	2.8	2.8
Ripple, mV	110	100
Review conclusion	With reservations	Not recommended

Only in one review: Temperature rise 78 °C (5 V UPS); Price 1.17 $ (5 V UPS).

USB DC-DC board, type two: Type two works but overheats, is limited to about 2.8 A, and has worse efficiency and ripple than type one.

5 V UPS: It is cheap and handles the rated current, but the author was disappointed by the large voltage drop when switching to battery.

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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