Okay. If it died when the charger was removed, you may have a dead battery. Recharge the battery and check it. Here is a link that shows how to do a battery load test:
https://www.2carpros.com/articles/car-battery-load-test
As far as the coolant, refill the radiator. With the cap off, start the engine and as it warms up, maintain the coolant level in the radiator. Make sure to have the heater on high while doing this.
Once it stays full, the heater is producing heat, and it is at operating temp, install the cap and fill the overflow to the max line.
Next, check for leaks at this point. If you see none, drive a very short distance and check for leaks again. If you find none and the level does not go down, it may be okay. However, if it got hot enough, there could be a head gasket related issue.
Try this and let me know the results.
Joe
Saturday, December 1st, 2018 AT 6:11 PM