They’re very useful! I’ve got a few because of all my travels
A 10,000mah power bank should be sufficient to charge most phones 1.5-2.5 times. 10,000mah powerbanks are fairly cheap at Officeworks. The cheapest models are about $35, though I’d personally go up to the ~$50 ones and get a Belkin or Cygnet branded one, just because I have more experiences with those brands than the black and gold-esque Otto branded ones
20,000mah powerbanks are also quite widely available, and go for about $70 bucks and should be good for a days usage at least (assuming you’re chronically online and had a power guzzling phone), or even up to a week if you rationed your usage and keep it off while not in use. They are bulkier though, so it’s worth weighing up whether you think there’d be a situation you need that much power in, and if the weight and size is worth it
One last piece of advice (sorry, I know you didn't ask)
Regardless of what cables you currently charge your phone with, get a powerbank with USB-A, and USB-C ports. I’m still using my oldest power bank 6 years later and have upgraded phones twice since then. Back then I thought USB-C was for rich people, since my phone only had micro USB. Now I dislike USB-A cables and prefer USB-C to C cables, but I have a massage gun with a USB-C port that will only charge with an A-C cable, and my Fitbit still has a full size USB cable. Also if you’re with mates and want to let them borrow it etc, just easier
useless_modern_god@aussie.zone 1 week ago
Weird coincidence , I just bought a power bank yesterday.