The Anker 535 Powerbank is a 30W PD (power delivery) version of the Anker powerbank series.

This Powerbank supports power input at 5V ⎓ 3A / 9V ⎓ 3A /12V⎓1.5A / 15V⎓2A / 20V⎓1.5 (30W). So the recommended charger we need to recharge this powerbank is an Anker Nano II 30W PD. 

https://www.amazon.com/Charger-Anker-Adapter-Compact-Foldable/dp/B091DS2M8X

You can buy this wall charger from Anker from the above link, or if you have any PD 30W wall charger such as a Macbook Air/ Macbook Pro wall charger, they will also work well with this powerbank.

Recharging time: 

According to our testing, it took 3 hours and 50 minutes to charge this powerbank via the Anker 30W wall adapter. It depends on the charging brick you are using to achieve faster recharging. You can use a 20W PD wall charger as well (such as the iPhone 14 adapter), but it will increase the recharging time. 

Note: But if you are not using a PD wall charger it may charge extremely slowly or it may never achieve a full charge.  

If you have any questions, please contact us for further assistance.