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Old 05-25-2024, 10:44 AM   #1
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Lithium battery wonít charge

2022 ePro sat outside in winter. Now the lithium battery wonít charge or wonít hold a charge. The solar charger suggests the battery is full, the main battery panel shows 0% charge and 0 running time. I did reset the yellow breaker relay multiple times. What can I do next?
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Old 05-25-2024, 11:47 AM   #2
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Did you measure the actual battery voltage at the battery posts with a DVM?

Before you blame the batteries it seems you are relying on monitors and such. See if your batteries are fully charged or dead and then work from there.
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Old 05-25-2024, 12:00 PM   #3
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^^ This. Use a multimeter to check. And if the batteries are actually flat and won't pick up a charge, you may need to "wake up" the BMS with an external charger that supports a low current charge.
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Old 05-25-2024, 02:13 PM   #4
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disconnect shore power........ is any lights or other 12v stuff working in the trailer?


if NO... check battery disconnect switch

If yes... we need more info on your setup
what battery and charger you have
what device are you measuring battery with (inside)
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Old 05-25-2024, 03:01 PM   #5
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Does your battery has Bluetooth control?
Mine had an option to disable charging or discharging. I did disable those while winterizing. When unwinterizing, it locked me out from re-enabling those using the original XingXiang (sp?) recommended program. I had to add and use Solar Killer app to allow me to reenable those.
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Old 05-25-2024, 03:03 PM   #6
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Been thru the worst possible lithium issue like this.

Believe me the first step is battery voltage at the terminals

List battery brand.

There only two serious parts in the box to fail.
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Old 05-25-2024, 04:48 PM   #7
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Been thru the worst possible lithium issue like this.

Believe me the first step is battery voltage at the terminals

List battery brand.

There only two serious parts in the box to fail.
I canít even get in to the terminals, and I canít see a name or label for the battery. Iíll keep looking but this may be beyond my ability. To access the battery you have to take the bed platform off, and it is nailed down. I appreciate the advice.
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Old 05-25-2024, 04:50 PM   #8
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Does your battery has Bluetooth control?
Mine had an option to disable charging or discharging. I did disable those while winterizing. When unwinterizing, it locked me out from re-enabling those using the original XingXiang (sp?) recommended program. I had to add and use Solar Killer app to allow me to reenable those.
No Bluetooth option. I donít know if the battery has a BMS or how to access it.
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Old 05-25-2024, 05:01 PM   #9
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460ah single mastervolt mli lithium-ion battery w/ safety disconnect; 3kw (3000 watts)/160a inverter/charger
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Old 05-25-2024, 05:03 PM   #10
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^^ This. Use a multimeter to check. And if the batteries are actually flat and won't pick up a charge, you may need to "wake up" the BMS with an external charger that supports a low current charge.
x2
Most likely the battery BMS prevented you from draining your battery too much. It shows zero, but probably it is more like 10.4. Multimeters don't work because the battery terminals only read what the BMS indicates. To get a good multimeter reading, you have to test the battery between the BMS and the
connections to the battery cells inside the battery which most people can't do with traditional cases.

Give the lifepo4 a traditional Jump charge with your truck and when it gets above 10.4 or so volts it will read correctly with a multimeter and take a charge. There are many tens of YouTube videos on the procedure.
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Old 05-25-2024, 09:22 PM   #11
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Often on the 12 volt panel the supply wires from the battery are there. Read the voltage there.

Typicall there is also a similar set of wires from the converter on the bus bar.

All shore power and solar and chassis power needs to be off.

The best possibility to wake it up is a very new modern charger like the Vitron. I own the 15 amp version. That can restore power via the wires from the battery in the panel. Most always. The jumper cables are the solution sometimes.

A dead bms will not awaken. A sleeping one would.
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Old 05-26-2024, 07:10 AM   #12
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If I found the right battery, the Mastervolt BMS doesn't seem to include low-temperature protection. Was this left connected and charging via solar or shore power during the winter? If so, the battery may have been damaged if attempted to charge it in below freezing temperatures.

https://www.mastervolt.com/products/...ultra-12-6000/
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Old 05-26-2024, 10:43 AM   #13
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There is a real possibility you may need to remove the battery and disassemble it.

I find it difficult to believe the manufacturer would install that battery with no reasonable access. Dumb engineering at best.

In a lot of cases you have to open sealed batteries with a circular saw.

If we had a picture of the fuse panel you might be able to use a fancy battery charger there. Often however you have to charge the cells directly to the cells not the terminals.
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Old 05-26-2024, 12:03 PM   #14
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This thread kinda makes happy that I donít have Li batteries. I guess when they are working they are great but seems you need to be an engineer if you have issues and you need to have a circular saw..
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Old 05-26-2024, 12:27 PM   #15
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This thread kinda makes happy that I donít have Li batteries. I guess when they are working they are great but seems you need to be an engineer if you have issues and you need to have a circular saw..
Will Prowse does that for effect. You don't need a circular saw. On one of my sealed lifepo4 batteries I had a bad BMS. I found that there is a sealed seam that can be pried open and resealed. The better lifepo4 batteries have screwed on tops with gaskets.

The reason some are "sealed" is that people can mount them outside as a "drop-in" style battery.
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Old 05-26-2024, 12:32 PM   #16
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This thread kinda makes happy that I donít have Li batteries. I guess when they are working they are great but seems you need to be an engineer if you have issues and you need to have a circular saw..
Only if you buy the "cheapies". I've had two Battleborn's for going on 5 years now and haven't had a single issue with them like described often on this forum.

Problems seem to occur inversely to price. Face it, quality does cost more.
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Old 05-26-2024, 09:49 PM   #17
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There is a learning curve with lithium batteries.

My $2200 worth of batteries had both bmsís fail.

The Tesla owners had a recent lesson.

More to come.

These batteries are sort of simple. My SOK batteries are designed for diy folks. They took care of the problem.
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Old 05-27-2024, 06:28 AM   #18
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Only if you buy the "cheapies". I've had two Battleborn's for going on 5 years now and haven't had a single issue with them like described often on this forum.

Problems seem to occur inversely to price. Face it, quality does cost more.
But then again, BB has devoted a page to what to do if your BMS goes into sleep mode.
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Old 05-27-2024, 08:00 AM   #19
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There is a learning curve with lithium batteries.

My $2200 worth of batteries had both bmsís fail.

The Tesla owners had a recent lesson.

More to come.

These batteries are sort of simple. My SOK batteries are designed for diy folks. They took care of the problem.

Spot on! It is the BMS that is the weak point. Lifepo4 is lifepo4. I replaced a BMS in a sealed battery and it was a PITA, but doable. With a screwed on battery top, it would have been a breeze.


There are okay BMSs and then there are well built and tested BMSs. Whats in your wallet...... (I mean battery)?
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Old 05-27-2024, 10:11 AM   #20
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Spot on! It is the BMS that is the weak point. Lifepo4 is lifepo4. I replaced a BMS in a sealed battery and it was a PITA, but doable. With a screwed on battery top, it would have been a breeze.


There are okay BMSs and then there are well built and tested BMSs. Whats in your wallet...... (I mean battery)?
For us lead acid folks.. what is a built in BMS? Battery Monitor System?
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