Search for "Play Battle City online" or "Tanchiki online free."
If you do not want to install anything on your hard drive, browser-based emulators are incredibly advanced now.
Remember that you can shoot through brick walls to create custom choke points, but steel walls require the max-level star power-up to destroy.
Leaving your base completely undefended to chase a kill is the number one cause of "Game Over."
If you want the exact 1985 game you played on Dendy or NES, using an emulator is the best route.