Convert Xiaomi LYWSD03MMC From Bluetooth To Zigbee

I flashed my LYWSD03MMC with zigbee firmware in December last year, now I replaced my battery, which was at 15% but after replacing the battery percentage remains at 15%. Does this take time, or do I need to do something else? The temperature and humidity works normally after replacing the battery

Edit: After a night’s sleep, the battery sensors are neatly at 100%