Positive ground…

[rustydusty]

Sorry, I meant parallel. And the charger I used with it is probably 45 years old. ( not smart at all…)

[rustydusty]

Storing an unused lead-acid battery dry should not cause it to deteriorate.

Have you been able to try a traditional transformer+rectifier charger?

I totally agree. The battery and electrolyte were still sealed in its original box. Problem is, the only traditional charger I have is indeed 45 years old and a 1 amp trickle/motorcycle system that I haven’t used in probably 30 years. Everything else I have is 12v only…

[Colsbeeza]

Hi Rusty,
I had the same experience a few years ago. I had a new 6V battery stored dry for about 25 years with acid in a separate bottle. I added the acid and stuck it on a conventional charger and nothing happened. It would not take a charge. I got a new battery.
Col

[rustydusty]

Okay then…


Seems like my stupid “smart charger” is smarter than me…


I received the new battery, tried to charge it, or “kick start” it with three different chargers and it still came up “bad”.
Finally, I looking really closely at the charger display, and noticed a tiny little “icon” that said: 12v. I pushed the mode button a few times and sure enough, there was a 6v mode. I thought the charger was smart enough to detect was type of battery it was connected to and would set itself accordingly. Well, it quickly charged my battery to “full”, I then hooked up my original battery and shortly had that one fully charged too! I guess I have a spare now…

[Greybeard]

Not so smart are they!