I have a Sharp VL-L270U that I bought at a thrift store. I dont have a battery charger and I've tried plugging it into a 12v lead but nothing ever happened. I want to get this thing on and running.
You will be needing a charger that is particularly suited to your device.
There are, out there, hundreds of different chargers, each is different.
Having said that, even if you get the right one, the unit you bought may not work, as it may have failed.
Some thrift stores have a bucket of chargers, but to start, look with a magnifying glass at your unit to see if it will tell you exactly and precisely what amps, ohms, volts, etc. you will need.
Remember too, the tiny plug can be reversed with the positive and negative interchanged, so you must get that right also.
God bless your efforts.,