Plugging in a battery can create a loud spark at the connector which is caused by the high battery current rushing into the low ESR capacitor first as well as filling up ESC capacitance. We’ve added a protective circuit to extend the lifespan of XT60 connectors and prevent rapid voltage or current spikes which can protect your electronics from damage. Version 1 Size: 18*16mm Compatible: Nazgul XL5 (ECO) Nazgul DC5 (ECO) BOB57 Frame Kit Version 2 Size: 25*18mm Compatible: Nazgul Evoque F4 Nazgul Evoque F5 V2 Nazgul Evoque F6 V2 SH CineFlow 5 Version 3 Size: 30*16mm Compatible: Chimera7 Pro V2 / Chimera7 ECO Chimera9 ECO XL10 V6 / CX10 ECO SH CineLR 7 Specifications Size: 16*18mm / 25*18 mm Input voltage: 3-6S (9-26V) Continuous overcurrent: 30A for 60 minutes Weight: 2.4g/ 2.6g Size: 30*16mm Input voltage: 4-6S (14-26V) Continuous overcurrent: 150A Instantaneous current: 160A Size: 30*16mm Weight: 4.5g Packing List: 1 x Anti Spark Filter 1 x Cable Set 1 x XT60E-M Plug (18*16mm/25*18mm optional) 1 x XT60EW-M Plug(30*16mm optional)