You should replace it with a different type of battery. You can solder a coin type battery holder to the old battery connector or even a AA battery pack. Those old barrel types are more prone to leakage and harder to replace when they go bad.
NO - DO NOT DO THIS! There is a current going from the motherboard to charge the accumulator. You have to solder a diode between the coin battery and the solder point (+) of the old barrel accumulator. If not, you may risk an explosion, an inferno, a desaster!
A safe way is to desolder or cut off (with a razor blade) the barrel type accumulator and to connect an external battery pack (3xAAA) to external battery connector. many boards work when you connect a coin battery holder (for 3V coin cells like CR2032) to the external battery connector.
Sorry, but it is a very bad idea to give advice without any clue. This is dangerous, man!
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