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I have purchased Ambrance Portable Charger (15600 mah) online. As per the instructions, it should be charged full for the first time. Batter charging time is given as 14-15 hours. I have charged more than 20 hours till now, But still i cannot switch on the Power Bank. Can i assume some problem in the Power Bank or shall i continue to charge for some more time. Appreciate if someone revert on the same at the earliest. Thank You