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Just bought one myself
Power up quickly with the Kogan 20000mAh 18W PD Power Bank, featuring 18W PD & Qualcomm Quick Charge 3.0 to charge up to 4x faster.
Impressive 20000mAh of charge
Two-way 18W PD fast charge
Features Qualcomm Quick Charge 3.0
USB Type-C charging
Backwards compatible
Pocket-sized body for on-the-go power
Basically any Lithium Polymer device should be treated with proper battery care; and that includes a fire safe box while charging.
Brand aside, if you want safety, you want Lithium Ion, like what is used in laptops, phones, and cameras.
I bought a rosmoss only because im going into hospital and needed power delivered same day (thanks amazon!)
It'll be ebay'd and a LiIon bank purchased after im healed.