Squamch
Canadian
I screwed up and left the travel trailer battery connected. Its down to 1v. My smart charger says it doesn't exist. Any tricks to bring it back, or did I just throw away $150?
This was hoing to be my suggestion.Use jumpers to connect another battery to the dead battery. Connect charger to the dead battery until it starts charging. After an hour or 2 disconnect jumpers and let charger do it's job. If you dont have another battery, and you have a charger with a "start" feature to jumpstart a car, sometimes that will energize a battery enough to start charging.
Use jumpers to connect another battery to the dead battery. Connect charger to the dead battery until it starts charging. After an hour or 2 disconnect jumpers and let charger do it's job. If you dont have another battery, and you have a charger with a "start" feature to jumpstart a car, sometimes that will energize a battery enough to start charging.
Use jumpers to connect another battery to the dead battery. Connect charger to the dead battery until it starts charging. After an hour or 2 disconnect jumpers and let charger do it's job. If you dont have another battery, and you have a charger with a "start" feature to jumpstart a car, sometimes that will energize a battery enough to start charging.
[486 said:;n286028]you just gotta put a dumb charger on it for a while
if you've got a rectifier laying around (dead power supply, a single diode, whatever man) you can just toss 120v DC at it for a while, limit current with a light bulb in series
Got it back up to 12.5 volts using the two batteries and jumpers method, but none of my 3 chargers would recognize it. Gave up and returned to Costco for a new one yesterday. Gonna buy a tender for it this week, or maybe a solar panel if I can find a decent price for one.
that's weird that it would measure 12 volts but the charger would not recognize it.
So dropping from ~2 foot and double charging are the method? I've got two Exide Edge AGMs that are "dead" at about 8V or a bit less. I've had one sitting on a charger for a week. They are about 4 years old with no use at all and not stored on concrete floor.
I don't know, but let us know what you do and if it works.
somewhere I also saw somebody say to reverse polarity for a few seconds, if it was totally dead, in theory it "blasts" all the shit off the plates, then trickle charge it as normal. Possibly tagged to another battery if on a smart charger.
I use a smart charger and can bring batteries back from the dead usually.
If the cells open make sure to top off battery acid / and or distilled water.
My exboss has used the trick of a 12v 1057 bulb to not overcharge for the past 40 years, taught me that with std chargers 20 years ago.
And how does this trick work?
The charger gets switched into restore mode where the charger either goes into 12v constant or 16v.
https://no.co/support/battery-sulfation