Posted by pete 23 on December 16, 2014 at 11:10:18 from (74.33.70.156):
In Reply to: Deep cell batteries posted by Notjustair on December 15, 2014 at 20:01:16:
I load test my deep cycle battery. I have the carbon pile tester so can put as many amp load on as I want. That will tell you a lot about a battery but it will not tell you how long it will continue to deliver a small rate of discharge. We used to find out these things out in the fish house on the lake. Hook the lights to the battery and see how long before you were in the dark. Amazing how different batteries would perform. Onto a little different situation here, but, I have a two year old battery in the riding lawn mower. It started giving problems late this fall. Would not crank engine. Jump it, check charging rate, voltage normal over 14 volts but next day,same thing. Took battery out , brought it home to check it. After sitting for a few days, the open circuit voltage was 12.4. Put my little test light on it and voltage dropped to 10 volts. Could not even operate a small test light with out voltage dropping to 10. So, I left the test light on to run it down. Two days later, test light still burning, voltage down to maybe 6 or 8 volts, can't remember. Put a larger lamp across terminals and ran it stone dead. Read almost no voltage after removing lamp. Left it sit a day, voltage reads like dead battery should, just below 12 volts. Hooked it to slow, 6 amp charger, it charged at about 4 amps until reached over 14 volts. Removed charger, hooked lamp back on , run it dead again and recharge. Left it set couple days, 12.6 volts open circuit voltage. Put load tester on over 150 amps and it held it over 10.5 volts for 15 seconds. Recharged to make up for load removal. Letting it set to see what happens.
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