Fred, my beloved Roomba, has had a bit of maintenance this evening. I disassembled the brushes and rollers and blew everything out with a can of air. Then I took a damp cloth and wiped down those internals where dirt has accumulated and washed out the dust bin.
After everything dried out I reassembled the parts and hooked him up to the charger.
I bought the high faluting Lithium Ion aftermarket battery upon which he will operate for just a tad under 3 hours. However, the down side is I can't just put the base station down and let him go at charging himself.
This new battery has to be totally discharged prior to a recharge or it throws errors during the charging process.
So I hook him up manually after having him run until the battery is totally depleted via a start with the "dock" button.
It's all very lovely from a labor saving device perspective and living on a sand hill like I do the carpets really can use the extra attention they get since I got him.