Zero Problems
 

I’ve had zero problems doing trickle charges on dead batteries. The charger I have does high charge, standard charge and trickle charging. I bought it about 10 years ago for around 50 dollars at Autozone.

Just make sure to keep lead acid batteries off concrete floors because they will discharge. If you need to take the battery out, make sure to place it on a block of wood or something insulated from your garage floor. Trickle charging is only recommended for batteries that are completely dead. You basically are bringing the battery back up to life slowly so it will hold a charge. The method doesn’t work with Lithium type batteries. Gell Cells, Nickle Cads and lead acid batteries can all be trickle charged.

I still have my bass boat battery charger it does it all.

That's a ton of work to avoid buying something that can be found for under $20 and you would probably use in the future.

I wonder why? I've been sitting car batteries on a block of wood all my life and I'm not sure why or how sitting then in concrete discharge them. I'm confident my dad is grandpa told me to do this when I was a kid and I've never looked back.

I bet someone knows the actual answer.

Wet
 

I think it’s a moisture thing and the ease of electron movement to the floor? Heat is a worse culprit though. Just like in a lab, the warmer it is, the more the chance for chemical reactions. It’s a better environment for electron valance migration.

There may have been a good reason for not storing lead acid batteries on concrete in the distant past but that is not true for lead acid batteries today.

Newer
 

It’s possible issues have been addressed. I did notice there were no caps to pop before charging on the last lead acid I charged. No telling what has been done on the inside of these. Shoot, I’m not even sure if they even sell the acid anymore. We’ve come a long way since Plant’s first work on batteries.

I guess it could be moisture, the electrons would probably go from one post to the other rather than the floor?

I suspect it has to do with the battery cases that are now made with better quality “plastics” than in the past, when charge leakage may have occurred.