A rather odd Crate of Haikus

1:

If you're positive,

I'm so super attractive-

My flow is current.

2:

I am a high spy,

Or a big help on the road.

I can be for Sky.

3:

Typical package,

You can do me in a ring,

But I'm just a square

4:

Rock, or metallic?

Holder of keys, or your vows,

Or maybe a sound?

Once you've solved all four riddles, you may spot a pattern among three of the answers, but one of the answers is an anomaly, which one is it?

• #2 isn't a true haiku, since the first line only has 4 syllables. COINCIDENCE? MISTAKE? CLUE?? You be the judge. Feb 8, 2017 at 22:47

If you're positive,
I'm so super attractive-
My flow is current.

Electron: Negatively charged- so attracted to positive, flow is called Current

I am high spy,
Or a big help on the road.
I can be for Sky.

Satellite: Spy Sats, GPS, Sky Radio XM

Typical package,
You can do me in a ring,
But I'm just a square

Box: Present Box,Boxing Ring, 2d box

Rock, or metallic? Holder of keys, or your vows, Or maybe a sound?

Ring: Diamond/Gold, Keyring/Wedding Ring/ Bell rings

I think the one that doesn't fit is

Box, because the rest could reference orbitals, this also link to the title as a crate is a box.

• We have a winner! Feb 8, 2017 at 20:13
• Uh beat me :P Well done! Feb 8, 2017 at 20:14
• Also maybe 'Crate' in the title indicates that the box is the odd one out? @Melkor can say if thats right Feb 8, 2017 at 20:16
• @BeastlyGerbil that's correct Feb 8, 2017 at 20:16
• Are you going to accept this? Feb 8, 2017 at 21:18

Pretty sure 1 is:

An electron

If you're positive, I'm so super attractive- My flow is current.

Electrons are attracted to positively charged protons, they are negative and there is a minus sign at the end of the 2nd line, and they flow to produce electricity.

First haiku

Answer is surely ELECTRON. (Electrons are negatively charged and hence attractive to positively charged things, their flow forms electric currents).

Second haiku

Must be SATELLITE (spy satellites, GPS, satellite TV).

Third haiku