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Break-in process on golf cart batteries

PostPosted: Fri Dec 04, 2009 12:18 pm
by stansroga
I have 6 new Excide golf cart batteries rated at 225ah hooked up in three banks of two. I am doing your Break-in procedure on 2 batteries at a time. I 've just completed the Break-in process on the first bank, as suggested by the Ample Power manal "living on 12 Volts", and I have several questions.

1. I did three charge/discharge cycles. On the first cycle the batteries were discharged to 10'5v after 177ah. By the third round we got 207ah. Is that as good as it gets or are the batteries defective? They are rated at 225ah.
2. During the "equilization" process the voltage got up to 15.85v at 5-10 amps for several hours using a 2000watt Xantac. The voltage seems way to high?
3. During the 3rd discharge cycle, although the batteries performed fairly well, they seemed to HEAT UP a lot during the first 5 (very approximate) hours of the discharge. This seemed strange being that I was only drawing off 11 amps? Note, I started the discharge immediately after the equilization was over.
4. After the 3rd discharge cycle was over the water level was almost down to the level of the plates, all cells equal. I added about a pint of water, using a Pro-Fill system to get the water back up. Is that water usage excessive?

Stanstansroga

Posts: 4
Joined: Mon Jul 20, 2009 11:58 am

Re: Break-in process on golf cart batteries

PostPosted: Fri Dec 04, 2009 5:38 pm
by Coulomb
Based on our testing of batteries, actual capacity is 15 to 30% less than claimed by some manufacturers. The specs may come from theoretical numbers based on the weight of active material. If they do testing at all it may be under a constant current load rather than a real life situation of a constant resistance load.

15.85 is not too high for an equalization voltage, depending on battery temperature. But you shouldn't be equalizing them as a normal process. That should only be done if the cell-to-cell specific gravity is not within 30 points.

You saw the latent heat build-up from the equalization process, not because of the load current. Batteries should be allowed to cool and come back to room temperature after equalization.

Water loss is a function of current, temperature, and time spent above the gassing voltage. You used a lot of water equalizing unnecessarily.