What kind of car charger do I need for a Lumia 640?

[pmc64]

I have a at&t branded 2.1A car charger that worked fine with my old lumia 920 but gives me a message about charging slowly with my lumia 640. This makes no sense to me cause the wall charger that came with it is 750mA. What kind of car charger should I use?

 

[xandros9]

Hmm, it should work just fine.

What I would do is disregard the message (maybe even turn it off) and see if charging is significantly slower as it claims in reality.