In brief: Based on review measurements: Test current: USB DC-DC board, type one (3.2 A vs. 2.8).
Model USB DC-DC board, type one 2019 Read review → 5 V UPS 2019 Read review → Voltage, V 5 5 Current, A 3 2 Test current, A 3.2 2.8 Review conclusion Recommended Not recommended
Only in one review: Ripple 100 mV (5 V UPS); Temperature rise 78 °C (5 V UPS); Price 1.17 $ (5 V UPS).
USB DC-DC board, type one: Type one handles more current, runs cooler and has less ripple; the author explicitly recommends it.
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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