House Battery voltage

[JWH11550]

I have a 2025 Prism MBE with dead house batteries.
There are 2 batteries. They each have 24v on the labels but they read 12v each (temporarily) when I check the voltage. They should be replaced with new 12v batteries, yes or no??

 

[John&Andrea]

if you have 24v batteries now then you have a 24v system and should stay with 24. Have you charged them. If a 2025 they may not need to be replaced.

 

[JWH11550]

I charged them, it sat for a long time. They don't hold a charge. But Shouldn't each battery read 24v not 12v?

 

[d23haynes57]

The 24 is the Group physical size designation. Letters after the "24" designate terminal layouts. I doubt very much that you have anything 24 volts in that rig unless someone mad a major change.

 

[JWH11550]

The 24 is the Group physical size designation. Letters after the "24" designate terminal layouts. I doubt very much that you have anything 24 volts in that rig unless someone mad a major change.

I have to take another look, you're probably right.

 

[Kevin D Pem]

I charged them, it sat for a long time. They don't hold a charge. But Shouldn't each battery read 24v not 12v?

I am confused!

Is the label part of the battery, or a label for the system?

24 volt batteries are uncommon, so My guess is you are looking at two 12 volt batteries in series. Make sure to take pictures before disconnecting anything.

 

[JWH11550]

I am confused!

Is the label part of the battery, or a label for the system?

24 volt batteries are uncommon, so My guess is you are looking at two 12 volt batteries in series. Make sure to take pictures before disconnecting anything.

The labels are on the batteries. It is not here right now so I will check it later.

Thanks

 

[Kevin D Pem]

The labels are on the batteries. It is not here right now so I will check it later.

Thanks

As stated above, likely a series 24 battery.

 

[Phillbo]

They may have been drawn down far enough to have ruined them. If they will not hold a charge replace them. Consider going to lithium.

 

[Kevin D Pem]

So this is a little information, two points:

Lead acid batteries have a voltage range between 12.00 and 12.67 when they have been sitting for 24 hours. 12.00 is completely dead if all cells are still viable.12.67 when fully charged under same rest conditions.

If discharged very slowly charge with a stepped charge source. A source that is designed to pulse charge may desulfate the plates.

Second is about replacement options.
A series 24 is the smallest auto format battery on the market. If you stick with LA batteries I would suggest 31 series batteries if they fit.

 

[Old one]

Always put in the biggest battery that can physically fit. It will also last longer.
The O P's words say a charging or stray current.
That's all I can do over the internet.

 

[AbdRahim]

Beware. If the dealer did not replace the batteries when you bought the rig, they may have ruined them by letting them run down on the lot. I had that issue with my last rig.

 

[JWH11550]

Beware. If the dealer did not replace the batteries when you bought the rig, they may have ruined them by letting them run down on the lot. I had that issue with my last rig.

I'm sure that's what happened, it was a "new" 2025 model.