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I use this trick to remove the 18650s.I turn the charger upside down,and press the moving metals next to the negative pole ,down.Voila,you have the battery down on your table.
Edit.
Because I saw that the charger got hot,during the discharging -charging cycle of the fast test,I put a 12cm/220V fan below the charger,and there was not any high temperature. Αξεσουάρ Ψύξης Μικροηλεκτρονικών CY 201 AC FAN SUNON 120X120X38MM 220V SUNON. CosmoMarket.gr .
It is in Greece,but I now found one shop in Slovakia as well.SUNON in stock | SOS electronic .
Edit.
You have to know,that there is not a cable ready for this fan,so you have to buy one and fix it.
I ask seller is charger original and genuine Liito Kala not some copy/replica of it, and he confirmed that is original, so I order one for 13$, and we will see when it arrive.
Ebay.
I aks seller after he told me that it is genuine, why price i so low and that price is suspicious for original product, he answer :
‘’The project uses surface mail shipping, in this way to reduce the price’’
I still doubt because if the price is 13$, ebay have their fee ( who I do not know how much is ), and shipping cost must be at least 1-2$, and seller must earn some $ so what is his purchase price of charger… 7-8$, I doubt it but we will see, I tell him that product must be as listed, new and genuine Liito Kala, or I seek protection and refund due to sellers lie.