It's hardly a remote possibility. Head over to the candlepower forum battery section for plenty of pictures of exploded lithium ion batteries due to cheap chargers.
That being said, not every generic charger is terrible. It's russian roulette. Personally, having seen the destructive power of lithium ion batteries (one quite literally shredded an aluminum flashlight and sent the tailcap through my metal french door when my friend shorted the battery by accident), I'll leave that chance for you to find out.
BTW an easy way for you to tell if your generic charger is working well is to get a $20 digital multimeter from radioshack. Charge up the battery while keeping an eye on the LED. As soon as the LED turns green to indicate the charge, measure and record the voltage. IT should be in the 4.20v area.
Use the battery for a while and then go to recharge it again. This time, leave it on the charger 6 hours after the LED turns green. IF your voltage is higher than the last time you recorded it, your charger is trickle charging longer than it is supposed to and it is dangerous to leave the battery in it for longer than it takes to charge.
Don't the HTC batteries also have build in protection?
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