This is the HPI Plazma NiMH 6.0V 1200mAh Flat Receiver Battery Pack.
Sized to fit the HPI Ken Block and Falken Micro RS4 vehicles
Plazma NiMH 6.0V 1600mAh Hump Receiver Battery Pack with BEC
NiMH compatible charger
Number of Cells in Series: 5
Rated Voltage: 6.0V
Pack Dimensions: 2.7 x 1.9 x 0.59" (70.5 x 50 x 15mm)
Yellow RC LiPo 1900mAh 7.4V 2S 35C , LaTrax 1/18 models Traxxas plug.