Old Battery

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As you can read from other posts I am in the hunt for a new battery.  The two I have now are identical Interstate 12v group size 24 deep cycles with the exception of one having a 12/2010 date on the battery and the other 04/2011.  The older one is the one that appears to be near the end of its useful life.

Charged it for 30 hours at 2 amps and let it rest for 4 hours.  The reading at this point was 12.51 volts.  After 8 hours it dropped to 12.29 volts.  One day later it now reads 12.22.

The other battery (4 months newer) was connected to the converter and was charging on our last trip, the last day being charged for just over 3 hours while we traveled home.  One day later I disconnected the ground cable.  It has now been 3 days since getting charged and it currently reads 12.75 volts, so all is good there.

It has been good and given great service.  The only difference between the two was on one of our first trips I decided to utilize the 12v function on the fridge by precooling it before leavinig.   After 6 hours I heard a beeping inside and then realized the battery's energy was depleted - how far down in voltage I do not know as I didn't have a voltmeter at the time.  Other than that they have had the same care and maintenance.  

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jato Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23 Feb 2012 Location: Kewadin, MI Online Status: Offline Posts: 3255	Post Options Post Reply Quote jato Report Post Quote Reply Topic: Old Battery Posted: 21 Sep 2021 at 2:28pm
	As you can read from other posts I am in the hunt for a new battery. The two I have now are identical Interstate 12v group size 24 deep cycles with the exception of one having a 12/2010 date on the battery and the other 04/2011. The older one is the one that appears to be near the end of its useful life. Charged it for 30 hours at 2 amps and let it rest for 4 hours. The reading at this point was 12.51 volts. After 8 hours it dropped to 12.29 volts. One day later it now reads 12.22. The other battery (4 months newer) was connected to the converter and was charging on our last trip, the last day being charged for just over 3 hours while we traveled home. One day later I disconnected the ground cable. It has now been 3 days since getting charged and it currently reads 12.75 volts, so all is good there. It has been good and given great service. The only difference between the two was on one of our first trips I decided to utilize the 12v function on the fridge by precooling it before leavinig. After 6 hours I heard a beeping inside and then realized the battery's energy was depleted - how far down in voltage I do not know as I didn't have a voltmeter at the time. Other than that they have had the same care and maintenance.
	God's pod '11 model 177 '17 Ford F-150 4WD 3.5 Ecoboost Jim and Diane by beautiful Torch Lake "...and you will know the Truth and the Truth will set you free."

Leo B Members Profile Send Private Message Find Members Posts Add to Buddy List podders Helping podders - pHp Joined: 13 Jan 2012 Location: Lyndonville, VT Online Status: Offline Posts: 4517	Post Options Post Reply Quote Leo B Report Post Quote Reply Posted: 22 Sep 2021 at 8:04am
	Hey Jato, That has to be a record for Battery life!
	Leo & Melissa Bachand 2017 Ford F150 2021 Vista Cruiser 19 csk Previously owned 2015 Rpod 179 2010 Rpod 171

Colt Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 16 Nov 2019 Online Status: Offline Posts: 383	Post Options Post Reply Quote Colt Report Post Quote Reply Posted: 28 Sep 2021 at 9:15am
	Try giving the old battery a really good equalization charge (top off the water with distilled first), say 15.5 v for several hours. All you can lose is a bad battery! BTW, normal charging should be started at about C/5 , or 15A for a 75A-Hr battery. I have a simple, old charger that is a brute and will "equalize" whether you want it or not.
	John '16 R-Pod 180