Dual, USB and universal chargers
Dual chargers charge two batteries in one session. That matters when a shoot needs several batteries ready at once: a single charger used in turn takes several times as long, and a day of shooting can be lost to charging. A team that runs several batteries should count charging sessions, not just chargers, when deciding how many to order.
USB chargers draw power from a USB source — a laptop, a power bank, a wall adapter — which makes them useful on location, where mains power may not be available. Universal chargers aim to cover several battery types with one unit, which matters for teams that run several camera kinds and do not want a different charger for each. Each type answers a different workflow question, and the workflow should decide the type.
V mount battery chargers
V mount battery chargers serve the larger V mount batteries, and they belong with the V mount line rather than with the general charger line. A V mount battery is larger, powers more, and mounts on a rig, and its charger must match that battery specifically. A general charger cannot be assumed to serve a V mount battery, and an inquiry for V mount charging should name the V mount battery type explicitly.
The distinction matters because a buyer who orders a general charger for a V mount battery will receive a charger that does not fit. Naming the battery type in the inquiry prevents that error, and it costs nothing to be specific. The V mount applications guide explains the batteries themselves.
What to ask next
Name the battery types the charger must serve, how many batteries must be ready at once, where charging happens, and the market you sell into. Ask for the specification for the exact type, the quantity terms, the lead time, and the certificates for your market, by name, with documents attached. The bulk charger inquiry page lists these confirmations.
Before payment, confirm the minimum order quantity and lead time for your order. Certificates are available upon request.