No matter how large your smartphone battery is, Murphy's laws dictate that you'll run out of juice precisely when you'd need it the most. To fix that, you can either lug an external power bank around (which will most likely be out of juice as well), or hope the fast charging technologies really work as advertised and grab a quick charge in 15 minutes or so.
While we keep waiting for a revolutionary battery technology that will make us forget these issues, it's interesting to how smartphones fare in a urgent 15 minute charge situation. And it looks like that the Zenfone 2 is the undisputed champ reaching an amazing 32% after just 15 minutes of charge.
After 30 minutes, the Galaxy S6 plays catch up and matches it at 53%, but we have to keep in mind that the Zenfone 2 has a 3000mAh battery, while the Galaxy S6 is only 2550mAh, which means the advantage is still on the Zenfone 2 side.
Just keep in mind that, for these Quick Charge technologies to work, you need to have both a compatible device, and a Quick Charging charger - which isn't always the case. Some brands sell you Quick Charging enabled smartphones, but the included chargers are just regular ones, that won't charge it any faster. For Qualcomm's Quick Charge 2, the charger must be able to provide 9V at 1.67A. And don't forget cables are important as well... if you're using cheap USB cables don't be surprised your charging times may take substantially longer (even though they appear to have thick cables, most likely it's only plastic, and the actual wires may be razor thin.)
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