Banana Plugs question

[Bing]

I'm building my first plane and bought two batteries; a larger one and a smaller one. The banana plugs on the BEC are 4mm. My larger battery is 4mm so no problem there. My smaller battery is 2mm so won't fit. Is there an adapter available somewhere that will allow me to use my smaller battery with the 4mm banana connector on my BEC? 4mm to 2mm.
Thanks!
Bing

 

[Hai-Lee]

I think you will find that the connectors are available separately so you could either change the connector on the battery to suit or make up your own adapter cable.

I repair and test fly planes for others and so I have a number of my own battery adapter cables so that I can use my own, (known performance), when doing a test flight session.