Well I got the ravpower 10400 yesterday. Charged it up and used it to charge my 7500 zero lemon. It charged it in half the time of the usual charger so that's a bonus. From 12% - 100% in about 4 hours.
Then used it to charge my yesoo 2600 in a couple of hours with some usage. All seems good thus far
thanks for all info folks.
Serial Flasher .... Take that how you will