Hi to all. Are there any battery cases available which protect IPhone the way like otterbox defender case does? I mean I would like to have the whole device covered and use external battery or battery case when I am out. Another question is are the battery cases able to charge the Iphone to full capacity (I mean 100%)? I know this question may sound stupid, but I got an external battery (not battery case), and it charges Iphone just by 20% and then the charging process is done. It is not good when you are out all day, need to use GPS with all the other apps and do not have the power by hand to charge the Iphone. Would you recommend to get a battery case or an external battery? Which one is better? And which model would you recommend? I would be very grateful for your advice. Thank you in advance.