My float charger I have keeps the voltage roughly at 13.5v but the moment it drops below 13.5v it spikes the full charging current until the voltage rises to about 13.65-13.7v which from what ive read is extremely bad for the battery as it discharges and charges taking power and causing heating every time. Every few seconds it would pulse current into the battery which would draw about 0.8 amps constant current until the threshold is reached and it stops putting current in letting the battery fall to 13.5v again and repeat.
That amount of ripple is unfathamably large. its pure ripple and not a constant 13.5v DC at all
On smaller batteries its even worse. it spikes up to 13.8v-14v every time the voltage drops below 13.5v from standby sitting.
Which happens much more frequently on smaller batteries and i’m guessing is really bad for it.
Should I throw this charger out and look for a bench power supply instead to just set a fixed dc voltage of roughly 13.5v with a low current limit of like 0.5A?