HappyModel 1S Series Charging Board V2 

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You can change the cell count with the provided jumper (V1 would only allow charging 4 batteries at the same time).
The charger will see the cells in series (i.e. charging 4 batteries will make the charger see a 4S battery with the capacity of a single cell).  Note this is not the same as parallel charging.

Specifications:

• Max amperage: 1.5A
• Supports up to 4 1S lipos simultaneously
• Weight: 35g
• Dimensions: 81 * 46 * 20mm
• Selection of the number of cells to be detected using the included jumper