This happens to me and all my friends. End of a full day of use.. battery is dead. Not much time to recharge before the next activity. How can I get the most charge in my phone before I have to leave!!??!!! What is the quickest way to get the most juice into my iPhone 4s in the shortest amount of time? I heard that I could use my iPad charger (10W / 2.1A) instead of the standard charger (5W / 1A). I believe that a slower charge will last longer (or so I have read). Are their warranty / damage issues if I use other methods? Where do I get the general guidelines Max Watts/Amps. Avg time to get to 25% / 50%. I have learned that it is not an exact science and that volts somehow come into play when using the battery meter. Any help would be mucho appreciated.