I have several BB Battery BP4.5-6 Batteries that I want to charge (these are 6V batteries).
To do so, I connected three of them in series. Then, I connect the positive end to the positive output of a V-Infinity (Model EPS180033) 18V 0.33A power supply, and the negative end to the negative end of that same power supply.
At some point over the night, the power supply quits working (I have done this a couple of times, replacing the supply each time) and will no longer put out any voltage whatsoever.
Is this a totally illegitimate way to charge lead-acid batteries?