Theoretically there should be no notable difference in play time. That said, adding an extra charge cycle for no reason isn't a great idea, so I'd recommend plugging in at the start.
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Option 1 would results in less playtime.
Every time you move power from one place to another, you incur a loss. Charging the frame from the battery bank, is not as efficient as using that power directly in the first place to run the frame.
A charge cycle is also the main source of wear for a battery cell, so option 1 would also be the one that is worse for the frame battery.
I'm not sure there's a whole lot of difference. After spending a little time with my frame I'm just viewing it as featuring hot swappable batteries that Valve didn't bother to include. The internal one really isn't good for much unless you like watching battery indicators rapidly decrease.
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