why does the battery measure 19v when I use a laptop brick to charge via circuit instead of 17v? Answered
reason for my question, my jump starter circuit board which i think it takes 17v but I am using a 19v laptop PSu to power it, with a 12v sla but when I check the battery voltage it is showing 19+ volts, why didn't the charger circuit lowered the voltage and regulate to 13.7 or 14v?
reading 19+ probably not good for the test SLA ?
can i use multiple diodes in series to lover my input 19v to exactly 17v dc will this make this charger circuit work properly, I have tested two different brand same reading.