better way: turn your phone off, charge it for one day. now next part is critical to keep it at 100% fully charged...*don't* turn it on
best way: buy the zagg sparq and an extra battery or two!
ultimate way: use somebody else's phone for all your fun and never worry about battery life again!
Yup, that works too because it does almost the same as an external charger - it is only charging the battery, not the phone to keep it running plus the battery, but as I said, buying a charger is really the way to go, because you can use your phone immediately simply by swapping batteries - you don't have to NOT use your phone.