Can anybody suggest me?

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Dear myLotters, I am going on another tour to Allahabad which is in Uttara Pradesh, North India Last time when I was in a tour to Varanasi I really felt a lot of inconveniences as there were a sufficient number of power points in the train. I went on searching for one for about half a day. Finally, the other day I got one which was made available for me at my request in some other place in the train. This time during my tour to Allahabad I do not want to face this type of situation I want to go for a Power Bank. Can anybody suggest me a good Power Bank for my Samsung Galaxy S4 smartphone? I want one with more capacity Durability that can charge my mobile quickly, safe to use and with indicator