Always outside-preferably off the premises entirely. Unless the house owner invites me to smoke, in which case yes, with the customer, but turn down most invites, coz I can't be blamed for any 'damage' that way.
I've got a couple of pieces of the ryobi one stuff.(2speed hammer drill & jig saw) and your right about the battery capacity. However they do an in car charger, thats got me out of the mire on more than one occasion. :oops: Got mine from our local shop-Savoy Timber-they do have a web site, but...
Wouldn't like to say exactly, but as a rule if I don't know the age of it (obviously pretty old though) rip it out and replace with nice new cable, just to be on the safe side.