Charging batteries simultaneously / at the same time

---

Okay. So I want to buy a minimum of one 1600 mah extended battery (in addition to the O.E.M. battery which came with it) for my Tilt, but I need a way to charge it at the same time as the other battery that will be installed in my Tilt. I have seen at least a couple of third-party cradles / docks (they struck me as cheap / poorly made) that do have a charging slot for said additional battery in addition to the connector for the bottom of the tilt, so yes they will both charge at the same time. Here's the problem: I bought seidio's slim rubberized case for my tilt, & I'm unaware of any other cradle / dock that will fit the Tilt with that case on it besides the InnoDock cradles that are on their website, & those do not have a charging slot for an additional battery.

So, do any of you guys know how I can charge an additional battery?

Are you guys aware of any other options available to me besides purchasing one of those cheap-looking third-party docks / cradles with the charging slot for an additional battery?
That would mean I would have a dual dock / cradle charging solution.
I hope there are other options.

Thanks in advance for your help, guys.