I have one that I've used very lightly for my SP3s and still carry in my bag. Now I have an SP4 i5/512/16 and have a power use case question. Which draws more power - bluetooth from the SP4 to the wireless adapter, or the Surface directly connected to the keyboard driving the backlit keyboard? I understand the wireless adapter would only drive my keyboard for a couple of hours, but if that's less of a power draw than having the keyboard directly attached and buys me an extra hour or two of power on the Surface itself that'd be handy when transiting for extended periods of time in the air.
When traveling the first four things I do is turn off bluetooth, lower display brightness, turn on power saver and disable the backlight on the keyboard, but if leaving the bluetooth on and attaching the wireless adapter to the keyboard and using the keyboard detached bought me more battery than vice-versa of the keyboard attached and bluetooth on I'd go that route.
Please advise.
Thanks in advance.