Thumbs up EVOPower Sync Dock with Spare Charger
Site: Amazon Link

Sleek Design
Support phone while sitting at an angle
Charges spare OEM battery while docked or otherwise
LEDs to show charging status
Will not fit with a case on the phone. Best buy - buy a quickly removable case (such as TPU Cases)

I don't have stock rom so I can't verify this triggers the phone for Dock Mode. Somebody will have to verify!

Once the spare battery is charged I flip it over to just hold the battery until I'm ready to use it.

PS: Does not throw my phone into a boot loop!!!

Love the purchase.
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::Sean LeCheminant // ATTSGS2-i777:: [rooted]
Daily Driver: AOKP 4.0.4 ported by task650, CWM
Kernel: Siyah ICS @ 200 - 1200, smartassv2