Battery charger sourcing checklist

Confirm what each slot accepts. AA and AAA are not always both supported, and Ni-MH and Ni-Cd support does not imply lithium support. Ask per model, because it varies across our own range.

Then ask whether the channels are independent. On some designs slots are paired, which means you cannot charge three cells and leave the fourth empty. If your customer is a venue running odd numbers of microphones, this matters more than the total current.

Finally check input and region: mains input with an EU or US plug, or 5V USB input over micro-USB or Type-C. That decision drives your packaging, your manual and which accessories go in the box.