how to check battery life? when i plug off charging cable my screen will blinking n given batter error?

Question

how to solve that ?

Answer 1

Some batteries, not all, have a self test feature that will give you a little bit more info as to their condition. Remove the battery and look for a press to test button. Press it and see how many light come on. This will give you an indication of charge. Try to give it a full charge and test it again. If it doesn't come up with all the bars, it is time for a new battery.
I hope this helps.

Answer 2

when u charge the battery, ie while powering on one display will come at the righthand corner of the screen. if u double click that it will show all the details.