A 6m Kiwicraft boat with 4 POB reported 500m East of the Tasman Reef with a battery problem and requested a jump start. Conditions were good with  a SSW wind of 8kts. An All Stations call was unsuccessful. Whakatane Rescue II was tasked and located the vessel. A jump start was provided and Whakatane Rescue II followed the boat back to Whakatane.