This is the ProTek R/C 2S 12-Battery Parallel Charger Board. Do you have a lot of micro flight batteries to charge? The ProTek R/C Parallel Charge Board will charge up to twelve 2S LiPo flight batteries with 3-Pin JST-PH connectors simultaneously, and also balance the individual cells of each battery during the charge process. The 3-pin JST-PH type of connector is found on many of the E-flite UMX airplanes and Blade 130X helicopter.
Your battery charger must be compatible for LiPo chemistry and the parallel charge process only works when charging batteries of the same cell count, of similar age and of similar discharge states. As long as these needs are met, plug in your 2S batteries to the Parallel Charge Board and let the juice flow.