question

@Vtecvfr

As Stefanie says your batteries are getting dangerously low if left uncharged for long!

I think your charge is out of sync because with 4% tail current and 3 mins detection time clouds (assuming solar charge) will trick the charger into thinking the batteries are full, so at some point when they were only 90% charged for example they've synced, this can compound over time. It's also why I have a Smartguage battery monitor as well as Victron.

*edit (if your charger is under sized, the BMV/Smartshunt etc can also assume the charge current when below the tail current means the batteries are full when in fact it's the charger size that's limiting the current.)

I have 2v Flooded lead acid cells I have set:

Tail current: 2%

Charge detection time: 6m

Charge efficiency factor 84%

I would try figures closer to these and keep an eye on voltages or even better Specific Gravity of the acid.

First off charge your batteries ASAP!

How are you charging your batteries (solar, AC charger)?

If you are charging from solar, your shunt is not configured correctly. Victron recommends the charged voltage to be 0.2-0.3V under the ABSORPTION voltage, not float. Inconsistent charging from solar can trip float-based charged criteria prematurely.

How is the charger configured?

Once you return to the cabin, you should make it a priority to get the batteries fully charged via generator or other means. Additionally, you should check all cells' specific gravity and likely conduct an equalization cycle via the generator.

Very good chance your batteries are being damaged.