Stay at your maximum range to limit the opponents visuals on you.
Make sure you have an escape path or at least some minor cover to hide by.
Create your BA loadout via the Buymenu Loadout screen, it already have the stock Crysis loadouts which you can alter as wanted. Set up different loadouts per mission objective, e.g. for BA Hunting or assaults on any armored Asset.
Share your C-Bills with the rest of the team. As a BA you only use roughly half of the C-Bills to purchase a full BA loadout form the C-Bills you get on the first rank. Players tend to become so happy when you donate your C-Bills to them
Mostly the BA should act as a support asset that can add an annoyance to your enemies whilst your bigger bipedal fellows are exchanging metal with the hostile targets.
BTW when fighting as a BA, its rather easy to get a piece of the kill ratio imo
, but it is by far the most risky of all assets
to venture out in. I've been hunting Lights to Assault as a BA or a team of BA's and an Assault better deal with the BA quickly if there is more than two having their attention on the Assaults.
I've hunted down Lights to the gates of their Hangar or worse as I recall once hunting one back home just to wait outside and pick up the target after he had repaired, just to see him go puff after some more minutes of torture.