Intact battery guard accubewaker 6,12 en 24 volt / Bluetooth control | bol.com
Battery Guard 40A 12/24V [ALM Part Reference - BGM40] - £49.95 : ALM Solutions, Auto Electrical Parts and Accessories for Cars, Boats, Caravans and Campers
Intact GL10 Battery-Guard Battery monitor 12 V Bluetooth support, App-enabled, Charge monitoring 15 mm x 60 mm x 45 mm | Conrad.com