I bought this battery to replace the old and weak battery in my Palm Zire31 PDA that would no longer hold a charge. For the Zire31 you have to remove the connector plug from the ends of the red and black wires and solder the wires onto the circuit board. The red and black wires on this new battery are much smaller than the wires on the original battery. The battery has been installed in my Zire31 for two weeks now and seems to be as good as I remember the original battery. Best Buy's price was the best price I found for this battery and ordering it from them online was very easy with reasonable shipping charges and it was delivered very quickly.