Benson & Company - The GoPro MAX Dual Battery Charger that comes with an extra battery automatically prioritizes which battery gets charged first, so you'll get a fully charged battery as quickly
Unboxing GoPro MAX Dual Charger + Battery - YouTube
Wasabi Power Batteries (2 Pack and USB Triple Charger) for GoPro MAX | HERO GEAR
Amazon.com: JYJZPB MAX Replacement Battery 3-Packs and 3-Channel Battery Charger for GoPro MAX 360 (Fully Compatible for Original GoPro MAX) : Electronics
Cargador de batería dual y batería de la cámara (MAX) | GoPro