You will find all available batteries for your Giant E-Bike here
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
EnergyPak Chargers | Giant Bicycles Official site
Giant Energy Pak Smart 800 E-Bike Battery – The Path Bike Shop
EnergyPak Battery Systems | Giant Bicycles US
Giant EnergyPak Smart 625 Integrated Elektromos Kerékpár Akkumulátor
Giant Energypak Side battery - MTBIKER.shop
What's new with the Giant 400 Wh battery on the lightweight Trance? | EMTB Forums