Testing batteries
05-10-2006, 09:26 PM
#1
Charter Member
Testing batteries
I have 2 group 27 deepcycle batteries I took in for testing. @ 2 places. Continental brand batteries.
1st place input 450 CCA in the tester, both batteries tested good. ( I thought the 450 was to low of input, hense shop #2)
2nd place used 575 CCA input, now both checked bad. So I'm thinking both may be border line.
I mentioned the previous shop test, so they rechecked. Now 1 was good.
Then they rechecked at 450, both good.
Do I have no bad battery, 1 bad battery, 2 bad batteries, or 2 unqualified shops?
1st place input 450 CCA in the tester, both batteries tested good. ( I thought the 450 was to low of input, hense shop #2)
2nd place used 575 CCA input, now both checked bad. So I'm thinking both may be border line.
I mentioned the previous shop test, so they rechecked. Now 1 was good.
Then they rechecked at 450, both good. Do I have no bad battery, 1 bad battery, 2 bad batteries, or 2 unqualified shops?
05-11-2006, 10:46 AM
#3
Registered
Re: Testing batteries
I think your right, they are borderline at best. If there remaining capacity is about 400-450 CCA, they will test good if tested as a 450 CCA battery, and bad if they are tested as a 575 CCA battery. Either way the batteries are weak and will fade fast at this point.
Merc recommends minimum 750CCA for a 502Mag MPI.
Dave
Merc recommends minimum 750CCA for a 502Mag MPI.
Dave
05-12-2006, 01:03 PM
#6
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Re: Testing batteries
Originally Posted by Fountain38SC
junk them, the last thing u need is a battery problem -trust me.
Bad battery would be at the top of my list of desired problems actually!
But in all seriousness, I agree that these sound like they are fading.
05-15-2006, 08:02 PM
#8
Re: Testing batteries
Update
charged both batteries for 2 days each @ 2 amps, and retested at 1st store, but had them use 700CCA. 1 Battery good, other required recharge and retest. I don't think so Tim, it was charged. So replaced it with a dual purpose battery with 1000CCA from AutoZone. Duracel (AutoZone) DieHards and many other are all made by the same maker: Johnson Controls. I 'think' JC also makes the Optimas????
If the other battery acts up this summer, I'll replace it with a starting battery.
charged both batteries for 2 days each @ 2 amps, and retested at 1st store, but had them use 700CCA. 1 Battery good, other required recharge and retest. I don't think so Tim, it was charged. So replaced it with a dual purpose battery with 1000CCA from AutoZone. Duracel (AutoZone) DieHards and many other are all made by the same maker: Johnson Controls. I 'think' JC also makes the Optimas????
If the other battery acts up this summer, I'll replace it with a starting battery.
