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Well as someone who went from a 64GB iPhone 5S to a 128GB iPhone 6S- I can assure you that the 6S has way longer/better battery life. So, your iPhone's capicity is not your only mistake -- there may be other "typos" -- for instance you may be using your new iPhone twice as much as the old one -- that would certainly hit the battery

Dude you have "wrong forum" typo lol, you are nearly ironic!
 
I bought an iPod touch 6th gen shortly after launch and I was disappointed with the battery life. It seemed considerably worse than the 5th gen I used to own. It's one of the main reasons why I returned it.
 
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