Almost 3 years ago I swapped out my 12V battery for two 6V (Trojan T-105) batteries. Last weekend, I noticed that my trailer was losing power really fast after charging up. I used a volt meter and discovered that one battery was reading ~4 volts and the other was reading ~6 volts.The water level looks to be fine on both.Is it possible that one battery is just bad? Is there some other issue I should look for? Should I just replace the bad battery, or do I need to replace both to keep them approximately the same age?

Almost sounds like a cell in the battery is dying

Know anyone who could bring over a charger capable of doing an 8v equalization charge? Or if you have a 12v Battery Tender you can possibly use that on the single 6v.

I believe you have happened upon the very rare situation where your GC2 has a shorted cell.Check your warranty but I think you need a replacement.

wopachop wrote:Know anyone who could bring over a charger capable of doing an 8v equalization charge? Or if you have a 12v Battery Tender you can possibly use that on the single 6v.Are you saying that the method of charging the battery can impact the length that the charge will last?

As mentioned above you might have lost a cell. You can try what's called an "equalization charge" and see if the bad battery can still be used. Wonder if the possible bad cell actually looks different if you shine a flashlight at night down the water holes.

One 6V battery discharging really fast | Good Sam Community

madjack60
Explorer
Dec 10, 2020
Almost sounds like a cell in the battery is dying
wopachop
Explorer
Dec 10, 2020
Know anyone who could bring over a charger capable of doing an 8v equalization charge?

Or if you have a 12v Battery Tender you can possibly use that on the single 6v.
time2roll
Nomad
Dec 10, 2020
I believe you have happened upon the very rare situation where your GC2 has a shorted cell.
Check your warranty but I think you need a replacement.
RichieW13
Explorer
Dec 10, 2020
wopachop wrote:
Know anyone who could bring over a charger capable of doing an 8v equalization charge?

Or if you have a 12v Battery Tender you can possibly use that on the single 6v.

Are you saying that the method of charging the battery can impact the length that the charge will last?
wopachop
Explorer
Dec 10, 2020
As mentioned above you might have lost a cell.

You can try what's called an "equalization charge" and see if the bad battery can still be used.

Wonder if the possible bad cell actually looks different if you shine a flashlight at night down the water holes.
RJsfishin
Explorer
Dec 10, 2020
OP
don't let them confuse you. You need a new battery. There aint no kind of equilizing (hi voltage) charging going to fix that battery w/ a stone dead cell.
Its just too bad you went w/ the hi $ Trojans, as you should replace w/ same.
Lwiddis
Explorer II
Dec 10, 2020
Certainly! Correct voltage for bulk, absorption, float and equalization are important. Trojan has the numbers on their site. .
2oldman
Explorer II
Dec 10, 2020
It's possible a bad connection can limit charging current to the one battery. 3 years is a year sooner than I went through Trojans, but maybe your usage is heavy. Replace both.
Lwiddis
Explorer II
Dec 10, 2020
X2, 2oldman. Replace both batteries.
capacitor
Explorer
Dec 10, 2020
https://www.youtube.com/watch?v=9g1xLnFsob0Could be the way you put them in parallel.