I have an iPhone 6. I left it in my car for a few hours and ever since the battery has been messed up. Will a battery replacement work?

I have an iPhone 6. Back in summer (super hot day, even for summer)I left it in my car for a few hours (by accident) and ever since the battery takes hours to charge and dies within two-threee hours. I found a vendor who will replace the battery, but will it fix my charging and battery life woes? Or could it be something else? My phone is updated to the most recent IOS and I don't really have any apps on it. I don't want to shell out $80 for a new battery if that's not the problem.

Is it okay to use an iphone as an e-reader for a textbook?

Is it okay to use an iphone as an e-reader for a textbook?

Added (1). I rented a chemistry e-book on amazon for one of my classes but I'm not able to open it online and only allowed to read it in the kindle app. My mac is too old to install the kindle app so i can only read the book on my phone.

Is it bad to use an iphone as an e-reader for a textbook?

I rented a chemistry e-book on amazon for one of my classes but I'm not able to open it online and only allowed to read it on a kindle or in the kindle app. My mac is too old to install the kindle app so i can only read the book on my phone.

Recording Netflix in the UK?

I live in the UK and know there are websites whereby you can record streaming from Netflix and watch, offline, on a laptop, iphone etc, however, is there an actual recording device, perhaps similar to a smart box, which allows me to record Netflix programmes, then watch them back on my television, at my leisure, just like you would Sky+ or TIVO.