Extra Battery or Portable Backup Battery Charger

My cell phone has evolved over the years from a new fun luxury to by far the most important piece of technology I own. I mean seriously, this thing not only allows me to make phone calls from almost anywhere (except my parents house which is a cell phone Bermuda Triangle), but I can email, take pictures, navigate to anywhere, set my alarm at home, video chat with my nephew in Texas, and when I get bored, even play a game. So, imagine not being able to do any of those things, kind of freaks me out a bit. Here's where the extra battery can come into play. Let's say your out all day and taking pictures, listening to music, using the gps to find a new restaurant, checking Facebook and suddenly after a busy morning and afternoon, your battery enters the danger zone and you realize you may not be able to check-in on Facebook when you get to dinner, or you may not be able to show the server your barcode for your digital gift card. Oh dear God, no! why me, I hate these things, etc, etc. right? Well, the other alternative is you plan ahead and bring an extra battery. Take off your case, then the back cover then put in the new battery and power it up again. Your set for the rest of the evening. Here's another option- a portable battery backup charger, like these <----click there. with my previous two phones I always went on eBay and purchased a couple knock off replacement batteries and a wall charger. but with my latest phone,the Samsung Glaxay S4 ,I decided to stick with a backup charger instead. A couple reasons, I have a sturdier case on this phone that requires a bit of work to take it out, making it more of a chore and second i didnt want to have to worry about always making sure my back up battery was charged. the one i purchased will charge my phone 4 times over or if I need it to, I can charge my phone and my wifes at the same time or throw a tablet in the mix. If I just need a bit more juice until i can get to a charger then I plug it in for a bit and unplug when I'm good. Its essentially a portable power source that literally only requires me to plug it in and no removing back covers, etc. Ultimately, they both have there places- a small battery may be easier to carry in your pocket if your going out to dinner and the movies but if you are bringing a backpack, purse or laptop bag then the backup batter charger will be easy to bring along. Either way, its nice to know there are options so I don't have to miss out on my free dessert at California Pizza Kitchen because I can't show the server my CPK app! There's my two cents! Let me know what you think!