i gotta respectfully disagree with batteries plus.
there is a reason those big 8D's are rated at such high cold cranking amps. that is to turn over our big starters.
putting a light bulb on it to load test it is nuts. an 8D with several bad cells will still test ok with a 50 amp load let alone with a 60 watt light bulb which is 5 amps at 12 volts.
if you research it, you will find that you have to test an 8D with a load that is close to equivalent to the load put on it by starting it. that means 600-800 amps. there are carbon pile load testers that will test that.
i bought my starter batteries at sams club and they could test them and my agm batteries for my coach side at interestate batteries and they could test them.
just my two cents worth. and you get what you pay for.
btw, there is a reason there are 2-0 or 4-0 battery cables on our rigs. current draw.....
tom
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