My biggest concern with the T6 is how the battery life is affected with the Rockbox port.
After a day of testing, I've found that with Rockbox, on a full charge, you can expect to get around 6 hours of battery life. Which is a little less than the 10 hours of battery the stock firmware supposedly gets (although I don't think mine ever got that, though its hard to tell with its 3 bar battery indicator).
With Rockbox, I used the running time timer (resetting it when it had been fully charged) and for the most part had it playing when it was on over the course of a day.
For my needs, 6 hours of battery is plenty, since I use it mainly on my commute (which is at most 2 hours) and then when I get to work I plug it in to charge (with Rockbox you can have it charge while you listen, although once it finishes charging it will stop charging even though it's still plugged in). Yesterday I tested it out by only charging it once and using it throughout the day at work, not plugged in, and it only died after my commute this morning. So it can actually last me a whole day on one charge.
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