Interested in reviews of AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white? It got 4.8 out of 5 stars from our customers. Find specific customer reviews of AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white below. We will appreciate if you also share your experiences with AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white after purchasing.
Rated 24/06/2022, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white
Verified purchase
powerbank what to deliver, treads as it should
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Tomáš, Praha
Rated 09/06/2022, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white
Verified purchase
I measured the delivered capacity (when fast charging from USB C) slightly over 14000 mAh (charging the battery with the same voltage as the power bank).
Good price / capacity and capacity / weight ratio
USB or micro USB
Fast charging can only be done on USB C (description declares that 18w output is on all ports)
He can' t charge himself and other devices at the same time
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Pavel, Ústí nad Labem
Rated 19/01/2022, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white
Verified purchase
favourable price
relatively small dimensions
Unnecessarily 2× USB-A, still can't charge 2 phones fast at once, but that's not a big deal.
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David, Jihlava
Rated 15/07/2021, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white
Verified purchase
Capacity
Vice of the show
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Vít, Český Brod
Rated 04/07/2021, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white
Verified purchase
Amazing capacity.
none
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Michal, Dlhé Pole
Rated 05/02/2021, variant AlzaPower Onyx 20000mAh Fast Charge + PD3.0 white
Verified purchase
Capacity cool
As soon as I unpacked it one port didn't work
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Ivo, Vonoklasy
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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