Quantity   Component name
1 × B&D Dustbuster Extreme Connectors and Accessories / Euro Connectors
2 × 2S battery holder e.g.: https://www.aliexpress.com/item/32847696147.html
1 × 2S BMS - 20A - balanced version e.g.: https://www.aliexpress.com/item/32863604994.html
2 × 18650 cell I used some cheap cells I got with a head-lamp
1 × USB 2S boost charger e.g.: https://www.aliexpress.com/item/32949889484.html
1 × Some wire (I used 2.5mm² / AWG13 + 0.25mm² / AWG 24)