Your typical portable power bank, one small enough to slip easily into your handbag or briefcase, holds enough battery power to recharge your typical smartphone two or three times.
The biggest power bank you’re typically allowed to carry onto a plane – one rated at 100 Watt-hours, the limit in many countries – can recharge that phone six times.
John DavidsonColumnistJohn Davidson is an award-winning columnist, reviewer, and senior writer based in Sydney and in the Digital Life Laboratories, from where he writes about personal technology. Connect with John on Twitter. Email John at jdavidson@afr.com
