You should be fine, but do be aware that those were designed to light cigs not power electronics. This means they have no real standards ( IE: They can be pretty much anything from like 5 volts to 16 volts based on certain situations and the design and anywhere around 10 amps ), the power can fluctuate which isn't good for electronics and especially for charging Li-Ion batteries which want a specific voltage, and also the plug itself is not suited to power electronics...they can vibrate loose for example, or worse "flicker" supplying power on and off fast with the engines vibrations.
So: Car chargers are fine for the occasional "Woops, I forgot to charge my phone last night and I'm going to be on the road the next few hours" but daily charging will start to decrease your batteries life over time due to the fluctuations, intermittent connection, etc. Use a stable power source like a surge protected outlet for your normal charges.