Requesting solution from knowledgeable RV.NET collective

MDKMDK wrote:
Yes, they are. And you can mount them upside down if you want. Try that with your "wets". :B

Guess what happens if you forget to recharge them to 0.5a/100AH at 14.x volts until amps taper that low. (see that guide and the other brands' guides, same thing.) You need an ammeter and a charger that will hold 14.x volts for as long as needed to get that done, which many chargers/converters can't do.

Also AGMs can be mounted sideways but not upside down.

2oldman wrote:
24dc is the group, not the voltage. I know, I'd never heard of it either.

Lol that's what the 24dc meant.:) I was assuming the OP wanted to wire in series for 24 volts.

Yes, they are. And you can mount them upside down if you want. Try that with your "wets". :B

AGMs are not set and forget anymore than Wets are. See AGM charging guide here:

https://www.trojanbattery.com/pdf/TrojanBattery_UsersGuide.pdf

Missed the GR24 part. This model might fit better in your battery bay location, physical size-wise. Fewer Ah but you said you don't get off grid much, so these might work better for you. Still a decent East Penn Mfg. built battery.
https://www.samsclub.com/p/duracell-agm-deep-cycle-marine-and-rv-battery-group-size-sl34magm/prod3590225?xid=plp_product_1_2

To answer your question, yes a pair 12V's or even a single 12V battery will be fine if you never dry camp or don't have to run a residential fridge while parked for any blength of time.

24dc is the group, not the voltage. I know, I'd never heard of it either.

A couple of these will work on/off grid, should you find yourself in a place with no hookups.
https://www.samsclub.com/p/marine-27magm-18-mo-free/prod21234614?
Not too pricey, and AGMs are set 'em, and forget 'em. Good in hot/cold and maintenance free. Good total amp hour rate, not T105 good, but good for a night or two off shore power. No idea what your charger looks like, so get a good one, if it's an old single stage, and you'll be good to go.
Take care of that medical issue first, though. Batteries can wait.
Best wishes, and good luck with both.

Thanks all.

opnspaces wrote:

RV-1/2n-FUN wrote:
Need to replace 2yo T-105s due to my neglect and wondering if 2-12V 24DC in parallel are a wiser less expensive choice since not using MH dry-
camping?

https://www.walmart.com/ip/EverStart-Lead-Acid-Marine-RV-Battery-Group-24DC/180350522

TIA for expert opinions as always

If as you say you are not using the MH for dry camping. And if we can assume you are always going to be plugged in to shore power. Then buy the cheapest battery you can.

The two 12 volt batteries will work fine for you. Your current T-105's are wired in series to give you 12 volts. If you replace with 12 volt batteries then make sure they are wired in parallel so you still only have 12 volts.

Yup, the T's are in series as we all know so the 12's have to be parallel and just figure that in the 10 years we have had the MH we have never Dry Camped and due to my prostate cancer are using it even less.

RV-1/2n-FUN wrote:
Need to replace 2yo T-105s due to my neglect and wondering if 2-12V 24DC in parallel are a wiser less expensive choice since not using MH dry-
camping?

https://www.walmart.com/ip/EverStart-Lead-Acid-Marine-RV-Battery-Group-24DC/180350522

TIA for expert opinions as always

If as you say you are not using the MH for dry camping. And if we can assume you are always going to be plugged in to shore power. Then buy the cheapest battery you can.

The two 12 volt batteries will work fine for you. Your current T-105's are wired in series to give you 12 volts. If you replace with 12 volt batteries then make sure they are wired in parallel so you still only have 12 volts.