Shall I upgrade from iOS 7 to iOS 9.2?

My iPhone 4s runs iOS 7.1.2 and unfortunately, its battery is not the best since when I'm connected to Wi-Fi, browsing the web or anything it tends to go down a little faster than it would without being online. I blame the OS on it. What do you think? Shall I upgrade the the latest version?

Should i get IPHONE 6S PLUS 16GB or IPHONE 6S 64GB?

Should i get IPHONE 6S PLUS 16GB or IPHONE 6S 64GB? - 1

Added (1). Only reason why i want PLUS is because of the bigger battery and OPTICAL IMAGE STABILIZATION… Is that worth getting the PLUS? However i would like the 6S 64GB because it has plenty of space. Opinions?

Should i get IPHONE 6S 64GB OR IPHONE 6S 16GB?

So the iphone 6s plus 16gb is the same price as the iphone 6s 64gb… Please give me reasons to which one i should buy… I know that the plus has OIS and a longer lasting battery but sadly since its 16gb i know i will use up the space quickly…

Should i get Iphone 6s 64GB or Iphone 6s plus 16GB?

So I saw that the Iphone 6S plus 16GB is the same price as the Iphone 6S 64GB… I'm wondering should I get the bigger phone and just deal with the short storage headaches because I really love that the Iphone 6s plus has a longer lasting battery and optical image stabilization but on the other hand… I use up a lot of space… 16GB would be used up in a week for me. So i'm thinking I should get the 64GB 6s which would have plenty of space but sadly the battery doesn't last as long as the plus and it doesn't have optical image stabilization… I want to know is optical image stabilization worth it? Or will i still be happy without optical image stablilization and a phone with plenty of space?

TV image/sound issue with receiver?

I have a smart tv and just got a onkyo receiver to connect bose speakers - 5.1 setup. I get sound from my wireless system - iphone, pandora, etc., which is great. I got a PS3 connected and it works great. But when I attach my tv hdmi to the receiver and select TV, I get nothing. The tv plays on other source ports fine, but nothing when I choose that hdmi port from the receiver. I have an older smart tv I guess, so I attached the audio to the receiver with jacks just in case that was the prob. Still nothing. Then a friend tells me I also have to get a video optical cable? To attache the tv to the receiver or its a no-go. Is he right?