2014 Plug in not starting even after replacing the battery

Just a possibility - that your alternator is shot. What your describing happened to my wife’s benz last winter. When charged the car would start - and drive - but because the alternator wasn’t charging while driving the battery would drain. good luck - but have a shop test your alternator.

 

measure the battery when the car is charging, and when the car is ready. if those values are okay, then it is not the inverter (aka alternator)

the other possibilities are a drain on the battery due to a short or corrosion, or you got a defective battery. (it happens)
also possible the new battery was in a low state of charge. they should be charged before use as the car is not very good at it.
testing for a quiescent drain with the car off is a bit complicated, and you need the normal value for your car from the service manual.
instructions can be found by searching here.

any aftermarket electronics on your car?

are you driving every day?

 

the other thread you are referring to said the car was draining the 12v when plugged in. a couple measurements as mentioned above will tell you if that is the case

 

Pepboys had the right answer. No alternator in a Prius. That doesn't mean the DC/DC converter is good or bad, but those very rarely fail. It's super easy to just measure the voltage at the battery while the car is running to verify that it's charging. It's unlike to be the problem, but easy to eliminate. (Ignore whether the ICE is running. Again, the Prius has no alternator. Just have it in READY mode.)

@bisco is sending you in the right direction. Measure the 12V battery's voltage at the battery terminals and also at the jump point in the fuse box under the hood. They should be close to the same. If the battery reads good and the jump point low, then there's a loose connection. Sometimes it's the battery terminals themselves, but the hidden one that bits a lot of people is the negative connection to the car's body near the 312V battery. Make sure it's clean and tight.

If the battery voltage itself is dropping, then there's some load that's staying on while the car is off.

 

That is correct, no alternator. Does your ready light come on? How about other lights? For example can you turn on your headlights, interior lights or are they all dead? Does your dash show state of charge of your hybrid battery or is dash dead?

 

By now, I'd think you'd have a charger and be using it.

If you don't have any trouble lights showing, then you won't find any trouble codes.

Yes, it might cost quite a bit. And/or, they will say your battery is fine, which it probably is. You need to locate the vampire load or the loose connection.

Please do. Happy hunting. Hope you get it sorted out quickly.

 

@bractar how often are you using the car, and how long are your drives? Ever had any accidental discharges, say a door left ajar overnight, or similar?