Charging voltage for stock battery

[Vinceb]

So I was smart enough to leave the lights on the other day, drained the battery to nothing. Attempted to start the car, not even a click for the starter, no power for anything.
Took the battery to Canadian Tire, put it on their battery tester, 30 min later the guy tells me it's no good. He said it has a bad cell and won't take any kind of a charge and that I need to buy a new one.

Decided to get cables from a friend of mine, took it home, re-installed the dead battery and jumped it. let the car run for 20 min with nothing turned on.

Took the car for a drive for 15 - 20 min came home and checked the battery, this is what I got:

13.90 volts - Charging with everything turned on, fan, lights, rear defrost, head lights.
13.06 volts - Car turned off for 5 min
12.82 volts - 3 hours later, car not running in between

13.95 volts - 2 days later fan and day time running lights on.

Does this seem normal? should it be charging at 14.2 - 14.5 ??

Toyota wants to charge me to test it and then they will give me a pro-rated price on a new one if it's bad. the car has been idling a little low, kinda rough since this happened (450 - 500 RPM). I've already driven 150km made up of several trips so the computer should have reset by now.

Canadian Tire Eliminator battery: $95
Toyota Stock battery: $135 (+ testing of $25)

130,000 km on the car, 2.5 years old