rc charger

Several listings specify USB-B connectors. Some adapter-style chargers are described as multi-port USB adapters (for example, a 4-port USB adapter for 3.7 V batteries).

The listings reference lithium batteries in multiple specs and at least one listing references Ni-Cd (nickel–cadmium) chemistry.

The listings describe sequential charging hubs (charging multiple batteries one after another, often starting with the most charged) and parallel adapter plates that let you charge multiple batteries at the same time—examples include adapters that handle up to three batteries either sequentially or in parallel.

Product details reference compatibility with quadcopters and mini drones, and some listings describe replacement chargers for cordless power-tool batteries.

Some chargers include a Storage Mode that holds batteries at about 50% charge. Others use a regulated dual-mode charge that fast-charges to ~80% and then switches to a long-life (trickle/conditioning) mode for the final ~20%.

Most single-unit charger specs list "Batteries Charged Simultaneously: 1 (max)", meaning they handle one battery at a time.

Wattage values vary across listings; examples shown include 1 W, 3.7 W, 12 W and 48 W in different product details.

Adapter plates and hubs plug into an existing battery charger (the charger may be sold separately or not included) and let you connect multiple batteries. Depending on the adapter design, they support charging batteries in series, in parallel, or sequentially (one after another).