[SOLVED] Can there really be bad portable charger?

Jun 16, 2018
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Hi there

I stumbled across a sale in a well known and trusted electronics store in South Africa and they had this portable charger with 12000mah going for around $20-ish. The brand is Swiss mobile which is unfamiliar to me. It doesn't have fast charging or wireless charging. This is one of the cheapest I have seen but I don't know if I should be sceptical. Can some portable chargers really perform poorly? Thanks for the help