I use a power pack instead of the TT battery.
I got over 6 hours of entertainment on a 29" HD TV, media player with a 500GB portable hard drive attached and occasionally use my laptop.
But I plan to put a lighter plug extension to the wiring of the tiny light under the microwave oven. I will only use this to recharge small devices and check the voltage of the TT battery.
In my 2012 A128S, it has this option. I took off the light because I think this is in a bad location of being hit, I somehow hit the light cover and broke it, so now I have an option to replace this with a lighter plug panel; (Loki) Please post the link of where you got the power panel. I would like to put that there.