Interested in reviews of AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black? It got 4.8 out of 5 stars from our customers. Find specific customer reviews of AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black below. We will appreciate if you also share your experiences with AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black after purchasing.
Rated 04/04/2026, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
The battery in the powerbank has ballooned after a few years of moderate use. It's probably fine if a cheap battery loses capacity after a while, but a blowout indicates poor quality control and a manufacturing defect that can cause a dangerous fire.
After a couple of years, it ballooned
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Lucie, Praha 4 - Nusle
Rated 11/02/2026, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
supports fast charging
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Jaromír, Plzeň
Rated 04/01/2026, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
Small and lightweight design
Ports
Capacity decreases more significantly with time
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Pavlína, Středokluky
Rated 03/12/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
Charges approx. 4 mobile
Takes a long time to charge, several hours
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Petr, Zlín 1
Rated 16/11/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
cheap
I complained after 3.5 months, it stopped charging. Settled within 30min by refund, so probably a system problem somewhere
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Anonymous customer
Rated 05/11/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
Satisfaction
battery capacity
heavier weight
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Milan, Olomouc
Rated 02/11/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
everything ok
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Jan, mníšek pod brdy
Rated 16/10/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
light
durable
lovely design
fast charging
fits exactly in your pocket
Nothing
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Jan, Věstoňovice
Rated 06/10/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
cheapest 20 ah
almost the lightest 20 ah
really tiny
only 315 g (not 325 as they say, 10 g has cable. )
nice workmanship
at least the 18 watts
eco packaging
quality product description
efficiency rather only 80-85%
only 18w
few charging protocols
Lipo
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Jakub, Praha 6
Rated 03/10/2025, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 black
Verified purchase
battery life
charging speed
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