Mamba xl?

You need an 7s capable charger, then it really doesn't mather if the battery comes with one ore two balance plugs. You can also purchase two batterys one 4s and one 3s and charge them individually.

Regarding the xl, i had the rev 2 and did work flawless, i have shipped it in for replacement as advised.. it have gone 3 months and not gotten it back.. but i assume the xl2 will work just as good and prob more reliably