Determine whether or not you are charging it with a USB adapter, or a wall adapter. Often times these tablets will exude more power than a USB is able to give, so when constantly charged that way, it can become less and less likely to hold. Instead, always plug your tablet into the wall, as it can give equal amounts of power as the 4 Sight tablet uses. Another likely cause is that the battery was not connected properly. One should take their battery out and see if there is any debris that this blocking the connection to the device. If this is not the case, a connector may have become bent or have suffered a corrosion, and can be unbent and replaced, using ones fingers, as to avoid the possibility of breakage. Wait several seconds, then turn on the tablet.