4 dead batteries. How do I get them to charge?

[bass57348]

Started the big motor a few weeks ago and then must have forgot to shut both main switches off. Now all batteries are dead and the Power Pole charge will not work. No operational lights. l thought that was probably from leaving the batteries on and now they are at 1 or lower v.
How do I go about recovering these batteries.
Thanks

[Welaka]

If they are @ 1v, it will take a while for them to start charging. If they are flooded cell, check the water, don't over fill, level will raise with charge. Also doubtful they are every very good again.

[CatFan]

Get a portable on them. Marine chargers in general won’t charge if the battery is below 2V to avoid arcing of loose leads

[yam911]

Parallel a fully charged battery with one of the dead batteries. Apply the charging device. It will then charge the both of them. Each according to the needs of each.

Repeat the process for each of the dead batteries.

[lpugh]

Disconnect the donner battery after a few minutes of charge time.

[haus9393]

Honestly if you don’t have any sort of 12v to put in parallel just buy a small charger at Walmart cheap. Like a 2amp or something and you will have to charge each one individually to get it back to life. Then after all 4 are charged up to be recognized by the power pole charge then hook it back up and it should work.

[lpugh]

Jumper it to your truck

[Rangerdeepv]

If they are flooded cells they are probably toast or close to it. The lithiums............it will depend on the BMS installed.

[bass57348]

Update..I got a couple to charge so far, enough to start the big motor. Tonight I will see if I can get the other two revived.

Thanks for all the help.