All lithium batteries are at risk of overcharging when left unattended. I do NOT leave my phone, laptop, or ecig to charge unattended. Ever. Under any circumstances. If I had a Tesla automobile, I would not charge that overnight either. Yes, all of these use the same lithium battery technology, and in some cases, they use multiple lithium batteries run in series, which increases the risk exponentially.
I don't think people have enough respect for the sheer amount of energy that lithium batteries can hold in such a small package. I can only imagine the disasters that await us once Mr. Fusion comes to market.
Marty's facial expression is priceless! If I look at this I can picture him thinking ''has time machine, always in a rush ''
As for the post, I charge my batteries from my laptop while I use it, and check if it's getting hot every so often. I don't trust the Ego charger too much.