dead battery on I pad

You don’t.

If your iPad’s battery is dead and you have never made a backup of your iPad's data all of this time, then it is highly likely that your iPad data and images maybe gone.

There is no way to get a dead iPad working if the battery is dead and the data inside might be gone.

Time to bring your iPad into your nearest, “local” Apple Store for diagnosis, evaluation and potential options.

An iPad out-of-warranty battery replacement is $99 U.S.D..

Apple Stores do not repair iPads.

Apple Stores offer replacement iPads, in lieu of an actual repair, though.

Since this iPad is very old, you could go online and search for either a local qualified and reputable third party Apple device repair center or longer distance qualified third party Apple device repair center that has experience in working with Apple mobile devices that can actually do a professional battery replacement of your actual iPad in case your data can still be retrieved from inside of the device.

Sorry & Good Luck to You!

Connect your iPad to your PC or Mac - then use iTunes (PC) or Finder (Mac) to copy your photos off your iPad to your desktop computer.

I'm not sure that will work if the iPad is dead.

If the iPad battery is dead, there is no power to the iPad.

There isn't enough power from a computer to power an iPad and so no way to make use of iTunes on a computer.