According to the user manual, it did not have a charger. It said to charge the battery by connection to a computer via the USB cable. It looks like a standard mini-USB to USB cable. You can use any AC to USB and the cable or a replacement cable. If the battery is no longer charging, there could be an issue with the DC input jack or the cable, or if the battery runs out fast, it could need a new battery.
But, any AC to USB and the cable, including a laptop or desktop computer.