While we're taking batteries, I'm just going to toss out a few points.
There are three basic ratings to look at when buying batteries: The warrantee period (which is a total joke), Cold Cranking Amps and Reserve Capacity.
Of those three, Reserve Capacity is the most useful rating.
There are only a handful of automotive battery manufacturers. They make batteries for everyone and they are sold under dozens of names. They are also made to different specs for different end products.
Warrantees mean almost nothing, so don't put a lot of faith in those numbers. Batteries are pro-rated and warrantees are designed to sell batteries, not to protect customers.
Cold Cranking Amps is a mildly useful number but it probably shouldn't be your only criteria when selecting a battery. It is the number of amps the battery can deliver for 30 seconds at 0 degrees Fahrenheit without dropping below 7.2 volts. There is a limit to how much current the starter can use (or draws) and sometimes there is even a limit on how much current actually reaches the starter (due to poor cable design). So you need a high enough CCA rating to spin the engine in the lowest possible temps and maybe a little extra for good measure - but after that it becomes superfluous. If you only need 500 amps to spin the engine in the absolute worst conditions, there's no benefit to buying a battery that can produce 1000 CCA.
Reserve Capacity [RC] is the most telling of the ratings. RC is the number of minutes the battery can produce 25 amps at 80 degrees without falling below 10.5 volts. (or 1.75 volts per cell). This is a much more useful rating for an automotive battery.
So when evaluating batteries, you want enough CCA for the coldest possible conditions and the highest Reserve Capacity. Sometimes you can give up some unneeded CCA to get a higher RC.
And I agree with Ian about the installation of batteries. If they can't do it right (or will not do it right). Do it yourself !
The battery posts and the cable ends need to be cleaned before they are installed. After everything is clean and tight, I like to use the spray-on type of terminal sealant. Some people prefer to use grease to seal the terminals but I don't think that holds up as well.
When I install a new battery, I use a silver Sharpie and write the install date on top of the battery in big numbers. That removes all doubt about how long the battery has been in use.