Battery pack for the MR-1
I've been trying to CF mod my MR-1 for a few months now, but I can't get past the start up screen.
After reading the past messages in this thread, there was a question about an external battery pack for the MR-1, especially for the folks that are installing a larger HDD. As you all know, the stock battery lasts a few hours, so an external pack is required if you're out and about.
Its power requirements are compatible with USB (ie. 5V), but the USB-in jack on the MR-1 cannot be used to charge. You can either hack together a USB cable to a power-plug, or you can purchase this cable from Dealextreme:DealExtreme: $1.87 2-in-1 USB 2.0 Power Data Cable for PSP
It is for a Sony Playstation Portable, but it is compatible with the MR-1. The nice thing about this cable is that you can plug it into your computer, use it like a USB drive and charge the battery without using that bulky AC adapter.
The other issue with a USB battery pack is that the MR-1 requires a high current, ~ 800 mA. Most USB battery packs output < 500 mA. Check the current output before purchasing. If you use one with a low current, the MR-1 will run off it for a few minutes, but then when it requires a high current, it will switch to the internal battery. So when looking for an external battery, look for one that outputs 1000 mA. I have this one, and it works fine:Macally | External Li-ion Battery for iPod | IP-A481 | B&H Photo