Stem Battery Attachment

[finite osprey]

Using it on phones is already pretty nice. A nice add on would be a fitted magnet so it can also magnetically be attached to your phone

[clever silo]

Powercell holder with adjustable attachment for phones and tablets

[finite osprey]

Exactly! Also while we're at it, stem external hard drive.

Whatever common accessories to help people not need to worry about what they're doing or where they're going

[gilded vine]

Thinking about magnetic

[subtle sparrow]

So…MagSafe power banks