New battery 2012-2016 FFE have 20.1 kwh
My ffe 2014 have 18.5 kwh and 20k mile

It's true
..... I have been looking for a 33.5 kW battery unsuccessfully for almost a year.

TSB 17-1009 replace Sync2 -> Sync3

Hello!
Your battery has little residual capacity. A whole 23kW battery gives a power reserve of approximately 75 miles.
You can put a 33.5 kW battery from FFE 2017+. In quiet driving mode it lasts for 110-120 miles.

On my FFE, I soldered a HVIL control circuit. Near PCM)

Buy in the nearest store in your city. Google "elm327"

You need elm327 and forscan ( https://forscan.org/download.html ) to read errors and parameters, do you have it?
You can read the error yourself and find the cause of the damage.

Ford Focus Electric consumes no more than 30 amps of alternating current during charging.
Usually it is about 29 amps.
A 40 amp breaker will be enough for you. I have done the same

https://owner.ford.com/support/sync-3-u ... tures.html free, download page