wopachop wrote:
We have the red HF charger here too. I trust the battery tender more to be honest. I wanted to leave it overnight. Instead of pumping in 10amps for a certain amount of time. I understand it has a "normal flooded" setting.
So i restarted the test. Batteries rested for 1 hour and were at 12.64v.
Plugged in 4amps and lights and at:
1. 10 mins 12.43v
2. 20 mins 12.42v
3. 30 mins 12.41
Not sure why i got 12.3v earlier.
So lets start over. Lets pretend we trust the voltage of my new batteries and theyre at around 90%. Is that normal to sag to 12.4v with a 4amp load?
NO.
Not "normal".
Not good.
12.64 is not FULLY CHARGED AT REST, should be right around 12.8V.
THEY ARE PARTIALLY DISCHARGED.
You are on the road to ruining them by allowing them to continue on at that state.
Throw that "maintainer" out, forget about it for THIS PURPOSE.
USE THE STUPID HF CHARGER FOR WHAT YOU ARE DOING.
That HF charger WILL NOT "PUMP" IN 10A for the entire time, it WILL TAPER as the voltage of the batteries rise and will do no harm (or much less harm than severely under charging which is what you are doing).
LEAVE IT ON FOR AT LEAST TWO DAYS TO ALLOW THE BATTERIES TO GET FULLY CHARGED.
Get it?
