Dynacore D-Travel Single D-Tap Travel Charger

The D-Travel charges through the battery's own D-tap socket rather than through a plate, which is what lets it be this small: 120 x 60 x 38 mm and 0.25 kg, so it packs alongside the cables rather than taking a slot in the case. Any Dynacore battery with a D-tap socket is a candidate.

It takes 90 to 240 V at 47 to 63 Hz, so the same unit works wherever the job is, and delivers 16.8 V at 2 A for a maximum of 35 W. That is a top-off charger, not a station charger. For two batteries at once, the D-Travel-2 is the dual-output version of the same idea.