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battery breakin

PostPosted: Fri Apr 15, 2011 12:02 pm
by Kristen
Does the battery break in info in the primer apply to AGM batteries?

Re: battery breakin

PostPosted: Mon Apr 18, 2011 3:45 pm
by Coulomb
Yes, and No.

In principle, all batteries will increase capacity and charge acceptance after the break-in procedure.

However, our limited experience with AGM batteries indicates that they will not recharge if discharged by 100 %. It appears the deeper the discharge, the greater the problem of attaining a full charge in a reasonable time becomes.

Re: battery breakin

PostPosted: Tue Oct 18, 2011 9:39 am
by dvkall
Sorry, now I'm confussed. In your books you say you can test how good a battery is by doing a 5 amp discharge and calculating the hours till the battery is at 10.5 volts.

However now you're suggesting that to do that with an AGM may in fact damage the battery? Am I reading your previous reply correctly?


Re: battery breakin

PostPosted: Tue Oct 18, 2011 12:38 pm
by Coulomb
We haven't seen AGM manufacturers publish results of doing 100% discharges and how to recharge after that. We don't know how its done.

We did some cycle testing some year ago with liquid, AGM, and GEL electrolytes. After 18 cycles the AGM units were pulled from the test. They were down to about 50% of their first cycle capacity. We tried a lot of different charge regimens but never found one to bring them back to full capacity.

We'd love to have an AGM manufacturer send us some units to test with the correct charge method. IN the meantime we can't recommend them for
deep cycle applications.

Under the circumstances don't do the break-in procedure.