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Wow this got crazy fast, I have used inverters a lot square wave. Sine wave never bought one or tried one. The inverter has never messed up anything, tube televisions would have bars going through the screen and a buzz in the audio, same as older audio items.
The items you plug into the wall for this, I call them power supply's not chargers.
They are now switching power supplies. If the AC voltage is not between 108 and 135 they don't use it.
A cigarette lighter adapter would always be handy!
In the past the imports would not supply power to the cig lighter if the key is off.
I have two 250 ford trucks. The cig lighters stay powered up all the time. The USB connection dies after about 5 mins. Which really messes with your head.
If I'm wrong on this post, please let me know I made this from my memory.
Rod ..