Question Does Any1 have Any Experience !!

Has any1 used any of these ???
are they any good ??



zl 7500 not available in India easily




http://www.ebay.in/itm/5800mAh-Exten...ht_1672wt_1037


http://www.ebay.in/itm/Black-5800mAh...ht_5331wt_1318


http://www.ebay.in/itm/6200mAh-Exten...ht_1054wt_1037