Battery Question
I charged 2 batterys in dec, put them in basement. Just checked them for first time one battery reads 12.5 the other 12.4. I guess I should have checked them sooner. Question is if the 12.4 battery wa...
Forum Discussion
I've had some DC 12v batteries than when fully charged and rested would read 12.8v
I've had others that would read 12.6v under the same circumstance.
I have an AGM battery that reads 13.07 volts when rested and fully charged.
These " universal" Voltage charts that proclaim states of charge are amusing, especially when it is not pointed out that these are rested voltages, not voltages under load.
Now if the voltage/SOC chart was given out by the battery manufacturer for their specific battery, I would put more stock in them, but I would not put any stock in them unless the battery had not seen any charging or discharging source for many hours, unless I had been monitoring them for many many cycles while discharging them in a similar manner.
If someone sees 12.02 volts under a 5 amp load and freaks out cause such and such a chart says it is in the danger zone, well I guess the only damage done is on the person who freaks out and starts recharging prematurely, and this can only be a good thing for the battery, so no harm done.
Unless you fire up your generator next to me.
I've had others that would read 12.6v under the same circumstance.
I have an AGM battery that reads 13.07 volts when rested and fully charged.
These " universal" Voltage charts that proclaim states of charge are amusing, especially when it is not pointed out that these are rested voltages, not voltages under load.
Now if the voltage/SOC chart was given out by the battery manufacturer for their specific battery, I would put more stock in them, but I would not put any stock in them unless the battery had not seen any charging or discharging source for many hours, unless I had been monitoring them for many many cycles while discharging them in a similar manner.
If someone sees 12.02 volts under a 5 amp load and freaks out cause such and such a chart says it is in the danger zone, well I guess the only damage done is on the person who freaks out and starts recharging prematurely, and this can only be a good thing for the battery, so no harm done.
Unless you fire up your generator next to me.
