Opinion Please on These AGMs for an RV

AGM batteries were developed for military harsh driving and condition.
They have very little purpose in normal vehicles to begin, but howcome they become stationary batteries?

Good info, thanks all. So how would they take deep cycling, doing 50-90s a few times in a row before being recharged fully?

And how would two in parallel (staying with 12v system) take supplying an inverter pulling say 100 amps for 10 minutes? My two deep cycle AGMs I have now are fine with that, but they are not telecom type AGMs like these.

I got the "string" figured out--that means in series, so you do add their voltages.

BluegrassBill wrote:
The first word in instructions is "Stationary" I doubt these could stand the bouncing in a motorhome or trailer.

AGMs can handle vibrations/bouncing around better than most batteries...no liquid. Even though they are 5 years old, assuming they were standby power they have very few cycle, BUT in a solar system they could have reached their useful life. In series means they were in 24/36/48 V system, not a 12V system. If I was close by like you and could make the size fit I'd buy them. I would check the voltage carefully and buy ones with the same resting voltage.
These are not engine starting batteries so CCA will be very low and you should not use them for starting.

It looks like a Quebecois wrote the manual. Lots of stuff missing. Ampere hour 20 - 5 - 1 hour rates. Glass mat batteries are by nature much stronger in their plate support regime. The grids are massive.

These are telecomm UPS batteries and should be treated the same as others of their class. See if you can score more specs from Deka including s cycle life chart.

If new they will outlast you and your pet tortoise. But they are not a high CCA battery so plan on around 400 CCA each.

Hi BFL13,

They appear to be telecom batteries from what little I could glean from the Deka site.

When I looked up Marathon I found:

"Genuine GNB Marathon Long Life Factory Fresh Front Access Terminal Backup Telecom Switchgear Standby Battery is compatible with most Emergency Critical Power Applications."

So they are likely a surplus acid design just as Mr Wizard and mine are with a different form factor.

However mine were only 3 years old. 2012 is 5 years old.

Mine behave more like flooded jars than AGM, but I'm happy with them so far.

BFL13 wrote:
Any more ideas?

No battery is worth anything unless you have the proper means to recharge it. Seems Deka has some pretty specific requirements for these jugs.

Good point. I get that they are meant for UPS usage. Some guys here are using "telecom AGMs" that are for that though.

Then there is the "starved" or not business ????

AGMs are supposed to be ok any way except upside down, but these deny the warranty unless upright.

Any more ideas? Thanks

The first word in instructions is "Stationary" I doubt these could stand the bouncing in a motorhome or trailer.