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I have not got round to getting a new battery for my MBP, as I have been using a mac Mini instead. I have been using Parallels for 5-6 years...
With 8Gb of RAM, I found allocating 4Gb to Parallels was too high - 2Gb seemed to work better for me. I could increase this to 4Gb after I had...
You can run Parallels from an external drive. However, I use Firewire 800 on my MBP (and Firewire 400 on my macbook). Either should be faster...