Table lamp is a battery with a battery seat button, plus a button battery how to change the battery
If your desk lamp is a rechargeable button battery, such as ML2032 (3V), LIR2032 (3.6V), this battery seems to have no card installed, only to find manufacturers in Ali to buy!
If your battery is a welding machine with the processing, that no way, it can only be scrapped, because the market is not with the welding of the battery processing!
If your desk lamp is a battery with a battery holder, then put the battery seat on the card to move out of the battery, to the market to buy the same type of button batteries, for example, your battery is CR2450, then you go to the market Buy CR2450 battery installed on it!