Your experiences using the JUMP START feature of a higher end battery charger ....

100 amp here ... if memory serves

I use and follow the old way to revive a old dead battery, use a 1 to 4 amp charger and charge it for 3 or 4 days at the lowest amp rating you can use
Same thing on low batteries that have set for 30 or more days, nice low amperage SLOW charge

cB .... this is the battery out of the older Airstream motor home....,

Not been driven for FOUR YEARS ......

I tried that activate for 15 minutes ... zip ‘

It’s now been on at the shop for over an hour .... 100 amps !

I’ll report back .....

I don’t think a trickle charger would do a thing !

Sometimes hooking another good battery to the dead one and then charge the both on a lower charge rate. May bring it back.

Thx Mr gAsSeR ... I had that 100 amp ENGINE START on it for over an hour .. zip ZERO ....

Pulling the pos alligator clip off ... no spark at all.

Now TOUCHING that clip on the other ... it almost LIT UP the room....,

I guess it sitting for 3 plus years DID IT IN .....

Next battery will be hooked up to the solar panel on the roof....

AND I GUESS the bank of FOUR six volters are toast tooooo !

The perils of owning an RV .... but it’s cheaper than buying a class B ...

Here’s the Airstream now ... Florida sunshine and that UV damage

Try what I told you. Doubling up with a good battery helps induce voltage into the dead battery. Try it. Wont cost you anything.

What kind of battery are we talking about here? A sealed maintenance free or one you can pull caps or an AGM? Makes a difference. Tread carefully when dealing with dead batts. They can be sulfated, they can be shorted and they can be full of gas. Ever seen a battery go boom? I have and it's not pretty.

Don’t have a good battery other than in the Charger ....

I’ve got to move the motor home tomorrow.....

New battery suggestions? Deep cycle marine RV style ?

And can make 130.00 or so seem cheap

A cheaper "home style" battery charger won't bring back a totally dead battery sometimes. A good industrial or mechanics battery charger can bring back a totally dead one sometimes when a auto parts store compact charger won't.

I've had luck with hooking it up to my charger and setting it to 6 volts instead of 12 overnight and then in morning setting it to 12 and it will charge normal.

a year or so ago, i got one of those pulse battery chargers that supposedly work on any type of battery.
i had a sears AGM battery that only had a .07v reading, as it had sat for many years.
i hooked up a regular lead acid battery with jumper cables [4ga] and let them hooked up for a couple days, then hooked up the pulse charger to both of them for quite a while.
i let them both set for a couple of days, then hooked up the pulse charger again. after a while, both checked at 12.2v.
i then charged the lead acid battery up. that didn't take long, then hooked the charger to the AGM battery. it was on for quite a while, but didn't get over 12.2v.
i then let it sit for a couple of days, and it [the AGM battery] registered 10.3. after a couple of weeks, it checked at 9.7. the last time i checked it, it was 5.62. that was a few days ago.
a guy could get it back to 12.2 easy enough [i think], but i'm guessing it wouldn't load test fer $hit. might be a good battery for testing circuits not requiring much load.
this is just my trial and error experiment. i don't know if it relates in any way to the topic at hand, but i found it interesting i could charge an almost completely zero volt battery back to 12 volts, and after many months of sitting around, it still has 5.62 volts registering.

Did it freeze? A dead battery will freeze and break connections between cells, toss it. Water in it? If just phosphated it can come back but takes a very long time.

Cheap? Well, you've certainly come to the right thread.

Is this why I was taught at a very early age to pop the caps on a traditional lead acid battery when charging? Don't know that this would really prevent anything but my dad had me doing so early on to "let gasses escape"

Doc, a 3-4+yr old battery in our climate is basically used up anyway. If its an AGM unit and fully discharged, I have had good results with the description NITROUSN gave of adding 2nd at least currently charged battery, paralleled with the first. For some reason AGM batteries are very difficult to recharge when completely discharged. Used to work law enforcement fleet. People were always forgeting to turn stuff off. Had to find a remedy and the 2nd battery deal was the ticket. Lead acid batteries were easier to recharge after total discharge. Major battery reps all agreed. They all suggested a recharging rate of max 14.5volts on AGM batteries also.Don't use a marine style battery for your engine battery except in a pinch(temporarily). They weren't designed for continual high amp draw of you starting system.Its Florida and its warm. Most any fully charged 12volt battery will crank up an RV to get it moved(unless it's a big diesel). There are signs for $35 car batteries all over the main roads in Fla. Drop one in and get your vehicle moved. Cheapest way out. Good luck Bill

Doc, you might want to try a battery charger with a "desulfation" mode.

We could give Doc the basic information on how to use a battery hydrometer to check specific gravity of each battery cell so as to find the bad cell, replace the acid in that bad cell with distilled water, then charge that battery for many hours with a pulse type desulfating charger,
OR
We could give Doc the basic information on how to go about locating the lost Hydrogen Bomb in the South Carolina coast swamps, how to remove it from the mud, and how to bore a hole in the bomb casing,
Question:
which would result in less fatalities?

Curious Minds Want to Know....

i will watch the second scenario on u-tube if DoC films it !

Whatabuncha wise guys ! .. and mopX!

Gotta go to the storage lot to put the FINAL TOUCHS on the motor homey....

CHECK OUT the Docs Diesel Dilemma!

I promise to address all here .. as soon as I get all the moving done !

I’ll ... BE BACK !