You will find all available batteries for your Giant E-Bike here
Giant EnergyPak Frame Battery 500 Wh 5Pin - Top Release
Giant EnergyPak replacement batteries for $200 | Electric Bike Forums
Upgrading to a larger battery. Trade in the new existing battery for a credit or just buy the new one and have two batteries? | Page 3 | Electric Bike Forums
Giant Energypak 500 Fahrradbatterie 36V 13.8Ah
Giant EnergyPak Battery 500 Wh - Trapoli
Battery: Dirt-E and Road-E 2017
Giant EnergyPak Frame Battery 500 Wh 5Pin - Top Release