HTC one charging questions.

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http://forums.androidcentral.com – Dear forum users, Iam planning to go and pick one up if I can find one in stock tomorrow. Can I ask you a question, Im still swaying back and form between HTC one and S4. What I want to know is I have heard that it takes some people form 40%-100% takes 6 hours to charge. Also plan to use google now and Waze navigation here as I travel a lot, I will buy in car charger, however i hear reports that battery still depleted while using navigation while using in car charger? Is this true? Did anyone tried? (HowTos)