Macbook horizontal lines and flickering screen

My 2017 MacBook is in need of a replacement battery. In the meantime, the display now has horizontal lines and is flickering between the lines and normal. When the horizontal lines are present and I am on the start page with the app icons, it also has vertical lines. It seems to be 3 secs of bad view, 3 secs of normal, with regular flickering like this. It does this whether it is plugged in or not, so does not seem to be a power issue. I have restarted the computer and that does not help. I have also tried to reset the graphics card by pressing option+command+P+R for 20 seconds after restart. I am traveling in Indonesia. The non apple shop technician said I likely need a new display. But since I haven't dropped it and it seems to be very expensive, I am looking to try troubleshooting it myself. Does anyone have advice on additional things I can try? Is it possible that the bad battery is causing the problem?