acer aspire battery not detected

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my battery is not being detected in windows 8.1 64bit, i have replaced the battery and upgraded to and ssd and it still says not detected, cant upgrade the bios and is say please charge the laptop, current bios is 2.08, the laptop is a acer aspire v5 -112p, it was off for a few months before i started to use it again. any ideas?

 

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turns out taking the back off again, unplugging the little battery cable to the motherboard and pressing the power button for 5 seconds and the plugging the battery back in makes it work!

 

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was working for 1 day now battery not detected again, also if i plug in the power cable or unplug it, the laptop immediately shuts off?