美国采购需求：电子、照明

I've purchased two black indoor wall lights, but I'm facing issues with them. Despite fully charging both units, only one occasionally powers on, and when it does, it fails to stay lit. I've tried various troubleshooting methods without success. Could you please assist me in resolving this issue? It's quite frustrating, and I need these lights to function properly. Any guidance or support you can provide would be greatly appreciated.