A guy at Verizon was telling us that cell phone batteries should be charged every night, that they can't overcharge because the battery charger shuts itself off when the charge is full - but that using a car charger would decrease the life of the battery because car chargers don't have that shut-off feature. So, what about my TX? Is it the same thing? Should I not use a car charger? And what about a travel charger that doesn't connect through the computer, but just plugs right into the wall?