Not sure, I never use my trackpad. Maybe check in the thread for BB users switching over? Sorry, I'm no help with this one.
After I let my device charge back up to 100, I tried turning off, unplugging, plugging back in, then turning on again to see percentage - it read as 100 when it booted back up.
So, I turned off, unplugged, booted back up, and it was at 98 percent. It seems reasonable that the boot process could suck up 2 percent of battery. However, after I booted, I immediately locked the device, waited 4 minutes to check again, and I had lost an additional 4 percent in those 4 minutes. No clue what this means, could that just be associated with the fact that I had just rebooted, and it was syncing everything which took up a percent per minute for 4 minutes, or could it be that the higher percentage points in the battery leak like crazy? Or, still just calibration?
GF has the Eris, so I'll try charging my battery in her device soon.