Battery problem

I bought a 2012 iMiev about six years ago and it's been running like a clock until today.

This morning my car was fully charged (16 KwHs), and I drove 14 miles to an appointment. About halfway there the turtle icon flashed on when I accelerated above 40 mph, and went away when I slowed down. It felt like the time I ran out of juice completely, and the car was underpowered. But I still had about 13 KwHs. Also, it was about 8F degrees where I live.

So what's going on? I have less than 50,000 miles on the car. Does it sound like the battery pack needs to be replaced? What can I expect to pay for that?

Thanks guys.

Hi there
It certainly sounds like a battery related issue similar to (but not as bad as) below as your car doesn’t shutdown

https://myimiev.com/forum/viewtopic.php?t=5176

First step is to invest in an OBD2 dongle and read out the pack data, btw how old is your 12V aux battery?