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I've had an SD card installed in my T1 since even before I booted it up for the first time, so I couldn't tell you if there was any performance difference.
But as for how long my T1's battery lasts, it generally takes at least 4 days of continuous usage for the icon to drop by even 1 bar.
I regularly spend around 3 hours on or waiting for public transit most days and read during most of that time, plus additional reading at breaks and between classes and sometimes in the evening, and I turn the wireless on and off so I can check stuff on the internet from time to time. Lately I've been finishing roughly 1 book per day (and additional shorts/novellas), and much of what I've been reading is between 150-250 pages.
I only bother to recharge when the battery meter has dropped to half, which is roughly every other week for me.
Hope this helps.
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