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Most likely it has a 3-button stack or "cylinder battery", 3.6v 50mah.
They are easy to remove by rocking it back and forth until it breaks loose from the motherboard. Generally these do not have a plug for external battery, but there may be a few exceptions. The jumper near the battery is a cmos reset and not a battery connector.
You will need to solder to reattach the new battery, so if you havn't done that a lot, you might ask someone who has to do it for you.
Easiest replacement method is to us a "Button Coin Cell Battery Holder Case"(ebay) and a CR2032 button battery, as that has leads and is easy to solder.
They are easy to remove by rocking it back and forth until it breaks loose from the motherboard. Generally these do not have a plug for external battery, but there may be a few exceptions. The jumper near the battery is a cmos reset and not a battery connector.
You will need to solder to reattach the new battery, so if you havn't done that a lot, you might ask someone who has to do it for you.
Easiest replacement method is to us a "Button Coin Cell Battery Holder Case"(ebay) and a CR2032 button battery, as that has leads and is easy to solder.