Small Disruption Shield (Apocalypse)
Like the Personal Disruption Shield, each Small Disruption Shield provides an extra 200 units of hit points to the vehicle that it is mounted on. The shield energy bar will even recharge slowly over time.
The small disruption shield is the most popular of the two varieties of shields as it is the most compact and will fit on many ships, including earlier aircraft like the hovercars. Its size is also shared by very many other useful optional vehicle modifications such as the two largest accuracy modifiers, Missile Evasion Matrix and even the Teleporter. This means that if you have sudden need of any one of these modifications, it can be added by simply swapping out one shield.
Arming a vehicle with shields, even if it's only one, will bring a whole new level of air combat to the playing field. Ships will be able to rush into combat, sustain a few hits, retreat, recharge and then fly back into the fray over and over again, meaning less downtime in the repair bay. Or even if the ships need a lot of time in the repair bay, fully charged shields can give them a temporary lease of life so that they can attend to an air skirmish - as long as the shields hold out.
Bear in mind that a newly bolted on shield will always be empty, so you cannot simply put on a new shield in the middle of a battle. You have to let the ship have some time to replenish its shield.
Finally, while shields can be mounted on some ground vehicles, destruction of the road underneath the vehicle will render the shield's benefits completely useless.
Vehicle vs. Personal Shield
Vehicle shields differ from the hand-held shields in that energy bar for all the shields mounted onto the vehicle will combine into a single bar. This has the advantage that you won't lose the individual shields as their hit points get used up.
The disadvantage to the combined energy bar is that once the entire shield bar is depleted, all of the shields are destroyed at once. Also, because the shields are not independent, energy will recharge at a constant rate no matter how few or how many shields are currently on board.