AGM battery question for the experts.

There are a few different ways batteries fail
Shorted cell (they never hit 12 volts)
high resistance (What you got is very very high resistance)
and as Mex said broken conneciton (Also very very very high resistance)

It's toast. replace it .

NOTE this assumes you are measuring voltage at the battery. if you are using a volt meter INSIDE the RV clean all connections first the problem might not be the battery.

Shot. Time to recycle it.

Thanks to all, it was indeed toast, but like my brother Mex, I too have a passion for tinkering.

The wood screw trick did work, but since the battery is the power source for a PWC (that takes quite a pounding) it became a core against a new battery.

Despite repeated tornado alerts all afternoon, a couple of my nephews and their friends and me had a great day turning recycled dinosaurs into frothy water on Lake Simcoe (Google it) this afternoon.

Thank you again for the education. Now for a sponge bath of Voltaren……..

wa8yxm wrote:
There are a few different ways batteries fail
Shorted cell (they never hit 12 volts)
high resistance (What you got is very very high resistance)
and as Mex said broken conneciton (Also very very very high resistance)

Or your WFCO fails and decides to run 21 volts to your AGM's.

Enjoy,

Perry

PerryB67 wrote:
Or your WFCO fails and decides to run 21 volts to your AGM's.

Enjoy,

Perry

If a WFCO or any other converter hits 21 volts, you will have more other pressing issues than a silly AGM battery.

WFCO is not the only converter that can go sideways when it fails and voltages over 15V can destroy more than a battery.

Modern converters do not need or depend on a battery to regulate voltages either..

The only reason I mentioned that "fix" in your particular specific diagnostic was to show a get-out-of-a-bind band-aid until a more suitable course can be arranged.

Mysterious breaks deep within a battery are doomed.

A high voltage screamer would help prevent high-potential disasters when aboard.

And an intrinsically limited charge maintainer self protects against runaway when a rig is unattended.

As far as connectors are concerned, the Concord Lifeline uses a Beryllium Copper post, which is much tougher than lead. I have no idea if other manufacturers offer the same level of protection. An L-Pad connector relies on a nut and bolt to clamp and if 316 stainless nuts and bolts are used corrosion becomes a non issue. Unnecessary post torque flex is avoided.

I believe Gdetrailer is referring to a charging device with power-supply quality output. Where disconnected, the device would limit noise *ripple* to say 20 millivolts maximum. Lifeline, demands this quality level of charger device right in their specifications.