iris+ with battery 5000mAh - 14.8V what happen?

i have the iris+ and i connected a battery (5000mAh-14.8V) but the Iris+ no replied the rc and it flight very strange,   no flight mode did good (althold, Loiter, Auto, RTL and Land), my question is, why happen that? is the battery or some else ?

than

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GPS failure AMP 2.6

all calibrations were good.
i did some fly like AltHold and it flew good 
later i went do the mission and failure it

why my GPS failure,, when start the mission the quad took off well, but later did it something very strange and crashed it, so, why ha

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