Samsung Google Nexus N3

We purchased a Samsung Google Nexus N3 in Austaralia in 2012 and it was used first in India then in Sweden, Finland, Poland before in dec 2015 the device crashed. Now back in Chennai, India, we have revived it by loading factory default software . However the battery is dying and I am unable to find a replacement.the reason for buying Samsung Google was its global brand image. Though all Samsung Galaxy batteries are same dimensions and similar specifications, the grooves on the battery peripheral lack plastic ends are very different. Short of flying to Austarlia, how can I source this battery, even online if required?