How to charge old Toshiba battery to transfer data to new Acer?

I have an old Toshiba 1805-S203 laptop with a broken screen and no power cord. The old cord had a 15V 4A output with center + polarity on adapter.
I’d like to get the data off the old laptop How do I charge the old battery enough to transfer the data? I have a “Tornado” fast transfer cable so I should be able to hook up the two computers via USB ports and transfer the data off the old Toshiba onto the new Acer, if I can charge the Toshiba’s battery. The Acer has a 17 v 5A female plugin on it’s power cord, but the end is too small. Any suggestions? Frank