 " Battery Pack "@en, VW-VBT190 "@en "Panasonic - Pack"@en
"
Features

3.6V, 1940mAh(min.), 7.0Wh
Uses Battery Charger VW-BC10

"@en 
 "GoPro Rechargeable Battery (for HERO4 Black/HERO4 Silver) (GoPro Official Accessory)"@en-US "Video - Page 5 | EISF"@en-US
"Lithium-Ion Rechargeable Battery for GoPRo HERO4 Cameras -1160 mAh."@en-US 