EV investors got a charge out of earnings news from electric car charging company Blink Charging (BLNK 28.55%) this morning, sending Blink shares up 21.6% through 10:45 a.m. ET. Rival charging company EVgo (EVGO 12.91%), which reported its own earnings last month, likewise rose today -- up 11.2%. A few electrons even kept bouncing all the way over to battery tech start-up QuantumScape Corporation (QS 2.34%) -- up 1.7%. Now let's find out: Is the excitement justified?Blink Charging Q4 earningsBlink Charging' ...