I'll likely purchase a Costco battery this coming spring. I tried re-charging my battery a couple times now but the voltage stays the same so it is toast.
I pulled the other cranking battery today when I finally stored my boat and noticed the water level was down in it as well. It was above the plates on all 6 holes so I added enough dehumidifier water to bring it back up to the proper height.
After I added the water, I checked the voltage and it was reading 12.56. Will this charge go down because I added the water or will it maintain that?
I know very little, obviously, about batteries but I would assume, since I added water, it will need a bit of a charge?
If so, is a Battery Tender JR OK to use in this situation? I have both, like I mentioned, but I was thinking about using the BT JR just to top up the charge before winter storage?
While I'm at it, will a BT JR or the like do any harm if the/a battery is already fully charged?
Thanks for the replies/info/tips so far.