Testing 6V Deep Cycle Batteries
I had my 6V batteries load tested at an auto parts store and they failed. They were tested while connected in series and so were tested as a 12V system. I took them back to Costco and they were replac...
Forum Discussion
pnichols wrote:
Hmmm .... I'll have to think about that for a minute: In what way could a bad 6 volt battery in series with a good 6 volt battery in any electrical way, shape, or form damage the good battery?
There are a few ways plus the older battery can be damaged as well.
First: IF one battery fails "Shorted cell" now the other battery is being charged at a far too high voltage.. That causes damage
If the one battery fails "Open cell" or HIgh Resistance the other battery is not charged at all.Or not fully.
If the older battery has LOST capacity then it may well end up reverse charged by the newer battery This will not damage the newer battery,, but it will the older one. And again the new battery will not fully charge.
THis is why you should always replace BOTH HALVES of your 12 volt batteries at the same time.. Just think of the two paired, six volt batteries as ONE SINGLE battery all the time.. And treat them as such.
NOW: This only applies to batteries in series
With batteries in parallel it's not as important they be identical
IN parallel for example.. IF one has a higher capacity.. We keep hearing how when one reaches full it will signal the converter to stop.. But the face is in parallel. When one reaches full THEY ALL REACH FULL Each shares both load and charging current accordign to their capacity.. The perfect Commune.
