Batt discharge rate

Charge #1 24 hours and check again.

Can't tell if you actually equalized the battery. What was maximum VOLTAGE.

Old "stupid chargers" are great for equalizing, as voltage can easily go to over 15 VDC. Yes, at very low amp rates.

Assuming these are wet cell batteries, I would charge until 15-15.5 volts is reached, and then see how long they hold a charge.

Yes, there are some "desulfating" chargers, but let us know what an old stupid one does.

tarnold wrote:
OP again, don't know which one was down stream, got shuffled.
Using a Schumacher shipnshore. Set to charge @15 amp, deep cycle. Each one charged for over 12 hrs. Charger shows charged to 100 %.
These are MAXX everstarts, 29DC.

I wish I had an Einstein SMART BANK ACCOUNT
Governor MOONBEAM specials in operation.

Here we go again with,

"I can't Charge The Batteries, the charger won't let me"

Grumble Grumble...

3 yrs old.. Batt 1 is ready for replacement and I would never buy one. Replace them both.

We do NOT buy batteries. We only rent them. In the RV world most batteries are murdered and not allowed to live a normal life. they work very hard and are tortured to death.

You can mess about with all kinds of tests and maybe revive it but I personally do not like sick batteries when I am boondocking. Dead or sick batteries lead to all kinds of other things not working properly.

OP again, don't know which one was down stream, got shuffled.
Using a Schumacher shipnshore. Set to charge @15 amp, deep cycle. Each one charged for over 12 hrs. Charger shows charged to 100 %.
These are MAXX everstarts, 29DC.

Batt 1 needs an equalization or recondition charge and test again.
Good battery fully charged should hold 12.65+ resting disconnected.
Maybe a little higher if these are AGM batteries.

The 12 Volt Side of Life

Batt 1 is sulfated. Batt 2 is in good shape. Was Batt 2 a "downstream" battery as wired?

Make and model? The manf. should have a resting voltage posted somewhere.

How's your electrolyte levels in the bat, do you have one of those bulb testers?

Sounds bat 2 is taking a long time to settle after a charge, and bat 1 is settling a bit low (12.7 is what I've learned for flooded lead)