Bests & Worsts Reviews from Amazon

I am trying to get a 2.1 Amp (or atleast 1 Amp) car charger for my HTC Vivid and HP Touchpad (CM7). These devices consume lot of battery when using gps in car. I had lot of hope on the amazon basics car charger. However, both my devices get only 500 mA from these chargers (which is not sufficient for GPS usage). The devices recognize the chargers as USB port and hence only 500 mA. I have performed amperage analysis on both Vivid and Touchpad using currentwidget for android. See customer images. 01/02/2011 Update: Well, few people have suggested me about "data pin shorting protocol" for phone to differentiate between real usb port and charger's usb port. I would like to question the rationale behind ME doing it instead of AMAZON (or whoever the manufacturer really is). My wall chargers already have these data pins shorted. They charge every device I throw at them including iPhone. So why can't amazon manufacture them with data pins shorted initially. Also I would not recommend end user meddling with power electronics. I value my phone and tablet more than a $10 (now $20!!) car charger. No thanks. Its simply not worth the hassle when its time to claim warranty.