1/2 cordless impact opinions

I'm a big Ryobi user. Big fan of their 18v one + lineup as the batteries fit everything from an impact, to a work light to a pole saw.....but....I have to agree with the above that remembering to keep a battery charged for something in a car would be problematic. The "one time" you go to use it, it'd be dead. Unless you plan on grabbing it on the go occasionally.