error 5 shows your having problem with the wheels not moving as they should ,,

1. Check the side wheels for obstructions.
2. Push the wheels up and down several times and shake out any loose debris that may be trapped in the wheel well.
3. Briskly turn both wheels by hand and make sure they turn freely and that each wheel exhibits the same amount of resistance. If a wheel cannot be turned by hand, place the Roomba on the floor and manually push Roomba a foot backwards and a foot forwards.
4. If compressed air is available, generously blow air into the wheel well.
5. If error persists on flat surfaces when there are no obstacles present, click here to contact iRobot Customer Support.

Check the output dc voltage of your Power Supply Unit. It should measure 22.5 volts. How are you charging your Roomba? Do you use a homebase? If you use a homebase, disconnect it and try charging by connecting the PSU directly into the charging jack on the side of the Roomba.

The charging err 5 is difficult to narrow down. Without a voltmeter you cannot verify the power supply is presenting the correct voltage to the Roomba. So at this point you could possibly have a defective PSU or a failed charging system component on the PCB or the battery is marginal/defective.

why the poor rating, this hurts my rating and even cause me to be booted, i sent you the info on this for the run time