4 ms·

What's the difference between carrying an extra replaceable battery with you, vs carrying an external battery you can use to charge the phone?

• JohnFen 3y ago
  Weight, bulk, and the time it takes to actually do the charge.
• rchaud 3y ago
  External power banks charge via USB. Most people don't want to walk around with their phone tethered via 4ft USB cable to a power bank in their backpack.