Batteries
Packs by voltage and amp-hours, without a machine in the box.
Battery charger SBC4.5A, Scheppach
Scheppach
Arnold
Dual fast charger SDBC 2x4.5A, Scheppach
Scheppach
A spare pack lets you keep working while the other charges. These are packs, not chargers and not machines.
Read the platform code on the tool you already own. Amp-hours set how long one charge lasts.