laptop can't charged

the problem of how often we use a laptop for hours every day is bateray quickly exhausted or can not charge voltage. if bateray damaged or run out quickly when fully charged then we can replace a new battery. but if the problem is batteray not be in the content then we can surmise that the first damage is an AC adapter (a tool to fill bateray voltage).
symptoms of damage to the AC adapter are:
voltage or electric current that comes out there is no or less. typically 18.5 volts 3.5 A suitable manufacturer
battery charge indicator lights blink off or are not bright.
if we have problems damage the AC adapter then we go to the store to buy the AC adapter in accordance with the laptop. we try before we buy, if the charging bateray that works and then we buy.

AC adapter