I have a load tester, you can get them at a lot of places like Harbor Freight:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=90636
It tests the load handling of the battery for short term and will tell a lot but it does not tell you if the battery is in the later stages of normal wear out, you need the electronic test for that and they do them at CHECKER and AUTOZONE.....can you say it with me AUTOZONE...I knew you could!!!
That is the only real way to know the condition of the cells