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Old 07-08-2020, 07:18 AM   #15
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Also note that when your plugged in your seeing a 13.7 voltage reading because your battery charger is running and putting 13.7v into your rig and charging your batteries at that time... To get a good battery voltage state you need to unplug your rig (or turn off the charger at the fuse box) and turn off as many 12v items as possible...
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Old 07-08-2020, 07:48 AM   #16
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Quote:
Originally Posted by dkonrai View Post
I can't read the stamping. Seems to be different years as the caps are different.

While you appear to have good batteries right now, consider replacing all of them when the time comes. A weak battery will draw power from a good battery to try and maintain the same voltage. Thatís a power drain that does not benefit you.

Ray
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Old 07-08-2020, 09:29 AM   #17
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All good advice above!

Your batteries behave well. Plan to keep them for a while.

You can usually get twice as many discharge cycles by drawing down no more than 50%. However, it will not hurt your batteries to draw down to 10%. You will just get fewer discharge cycles if you do it regularly.

Before you replace them, feel free to use them down to 10%. There is no sense to throwing away usable capacity.

Use good maintenance procedures.
Monitor water level. Fill only with distilled water.
Only store batteries fully charged. Storing lead/acid batteries below full charge will decrease capacity more than drawing them down to 10%.

Do not allow state of charge to drop to 0%. Flat out discharge will decrease storage capacity. Letting it sit discharged will kill it.

More good information:
Battery University https://batteryuniversity.com/

How does the Lead Acid Battery Work? https://batteryuniversity.com/learn/...ased_batteries

Charging lead acid batteries https://batteryuniversity.com/learn/...d_acid_battery

GEL https://batteryuniversity.com/learn/...d_acid_battery

AGM https://batteryuniversity.com/learn/..._glass_mat_agm

How to Charge and When to Charge? https://batteryuniversity.com/learn/...o_charge_table

How to Store Batteries https://batteryuniversity.com/learn/...tore_batteries

Summary of Doís and Doníts https://batteryuniversity.com/learn/..._battery_table

I wish you good luck and happy trails ahead!
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Old 07-08-2020, 09:42 AM   #18
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While you appear to have good batteries right now, consider replacing all of them when the time comes. A weak battery will draw power from a good battery to try and maintain the same voltage. Thatís a power drain that does not benefit you.

Ray
A weak battery is no different then a smaller battery tied to a large battery.

The smaller one will not draw power from the larger one.

A shorted battery will do what you said, drawing voltage from the other. Not all batteries fail by shorting out.
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Old 07-08-2020, 05:37 PM   #19
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check the top of the post, mine, that are about a yr old have the date code stamped into the post itself

https://www.trojanbattery.com/tech-support/faq/#Codes
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Old 07-20-2020, 08:53 AM   #20
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Well I ended up buying two new ones. 150 each with exchange.
Omg much better. I can turn all the lights, radio on, bath fan for eight hours and it's at 12.5 or so.
Now if I can find that 2.5 to 5 watt drain.....
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Old 07-20-2020, 12:51 PM   #21
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Originally Posted by Tomahawk View Post
Attachment 292310
SoC by temp F
Well, that certainly explains why I was mysteriously using so much charge overnight with highs in the 70s and lows in the 30s...
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Old 08-02-2020, 08:35 PM   #22
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Pair of new Trojans. Yes much better now
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Old 08-04-2020, 07:16 PM   #23
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Not trying to hijack here..... I think it's relevant:

My 2016 trailer has 2X 12V stock batteries and the trailer is plugged into shore power 98% of the time next to my house. The remaining time it's attached to the truck or at a full hook site. Except for once a year I do a week long dry camping trip. I watch the meter and run my generator +/- two hours a day.

At nearly 5 years I've never had a problem and just tested the batteries by unhooking in the driveway and running my furnace blower fan and all the lights for around 3 hours with no problems.

Is a 2016 (Keystone Hideout) trailer likely to have some type of conditioner to keep the batteries from being damaged by being plugged in all time? At 5 years I feel like I'm doing well.
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Old 08-05-2020, 07:47 AM   #24
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Just to add to the advice above, when you are testing the battery, let the battery rest, disconnected, for at least 15 min to get an accurate reading of the true state of charge. They say to wait more than 15 min, but I found that the readings at 15 min were the same as after a one hour rest.

If you test without letting it rest (or while there is still some small parasitic load, like the propane alarm), your reading will be a little lower than the true voltage.

One more thought -- keep the batteries on a battery minder when you are not camping. Don't let them run down. Don't ask how I learned this. Misteaks were maid.
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