Primo Battery Cube
 

http://www.phonesuit.com/products/Pr...nes-37-10.html

looks interesting. although as engadget points out, its not actually a cube lol.

Re: Primo Battery Cube
 

I wonder if devices like this (other than being able to support multiple devices) have any advantages over just getting a spare battery.

Re: Primo Battery Cube
 

I guess the only advantage would be not having to take out the battery... haha.

Re: Primo Battery Cube
 

They're also usually easier to recharge on the go - you can plug them into any USB port. The one I have actually uses 2 AA rechargeable batteries internally, so it also doubles as a battery charger (and I always have 2 AA batteries handy as well).

Re: Primo Battery Cube
 

I use this http://www.fommy.com/view-full-page.asp?skuno=83981

and I also use this http://www.dealextreme.com/details.dx/sku.67

The latter works pretty well with my Eneloops 16 AA eneloops that I carry in this case

http://www.amazon.com/gp/product/B00...ef=oss_product