If is the model gear fit 2 the you will have in your watch two contacts, then you can look for “Back Cover with Connector for Samsung Gear Fit 2 SM-R360” in Aliexpress, is better buy the whole cover with the contacts becouse is the same price. https://www.aliexpress.com/item/40000774... Also can by the battery, I had one unit with this problem, then you will need this https://www.aliexpress.com/item/40004494... Recently I have repaired two units I had stored in a drawer from 2017 as you, one replacing the battery and other replacing the contacts and now I have two usables watches so I can recover between the two more than € 200 that were useless, they had barely lasted a year. Regards