Another significant difference seems to be that I-blason is 500mah output and limefuel says 1.5a or 3times faster charging. I-blason may not provide enough output to keep your phone charging during use, which means it won't save you if your internal battery is near dead and you need to keep using your phone, since it may not give the phone enough juice to run the phone during use and have any left over to charge the battery. This may have significant implications for how it affects your internal battery's life. A high output battery could be left on to avoid your internal battery from ever having to get cycled, whereas one with too low output may constantly go between charging and discharging your internal battery. I may go with the i-blason anyway since it says its available starting today and the price is lower, but it may take more managing its use to avoid negative effects on your internal battery and to avoid getting your internal battery low enough that it won't keep your phone running.