Battery dead California T

That is not a battery charger, it is a battery tender. It is meant to keep a charged battery topped up, not revive a dead battery. If you had kept the tender on the car while you were away, you likely wouldn't have had this issue.

Do you own a battery charger and a voltmeter? Do you have the ability to remove the battery yourself?

 

Get something like this:
https://www.amazon.com/dp/B016UG6PWE/ref=cm_sw_em_r_mt_dp_KCYW00BKMQGTNKVKXX9G?_encoding=UTF8&psc=1

This is what I have for dead batteries. Hook it up and turn it on, then start the engine. Once started, take it out for a decent spin to get some charge into the battery, then put it on the tender.

 

No, it won’t. And they have safety circuitry built into them so if they are not hooked up right, they don’t let the juice flow. Once the car starts, disconnect the cables. Went to test drive some ferraris a month or so ago, and one of them wouldn’t start - they used one of these right in front of me to start the car.

 

My guess would be the battery is too weak, but not sure. Perhaps let it idle for 5 or so min, turn it off, and restart. you may have to use jumper again. I’m not familiar with what electronic systems may be keeping it from going into gear. When they jumped the one I test drove, it went into gear as normal.

 

Did it hold a charge?

 

Driving your car and using your alternator to charge a completely dead battery and of questionable condition is not advisable. Too hard on the alternator. The battery should tested, preferably a load test. Then fully charges with a battery charger. Then your in good shape. Other than this method you run risks with low power to all the electronic components.

 

I would never jump start a Ferrari, or any modern car. The Tech forum and various model sections are full of tails of woe from owners and cautionary advice from current and retired Techs.

If your battery is dead hook up a proper charger and fully charge it before starting. Then keep it on the battery tender.
The ctek unit you have is a great tender but it would take forever to recharge a dead battery.