According to the description it takes a "Fit to store up to 7.4V / 11.1V Lithium Battery into Stock Pipe"
either of those would fit. Based on what the website says for the AEG you listed, select the T Plug option
Deans connectors (T-plug) on the website comes in two sizes. So the mini T is just the smaller deans connector. The description for the AEG you listed only says T connector so I would guess its not the mini T