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Increases your Energy Shield's Durability and Recharge Rate by a given percentage.

At higher rarities, some Shield Boosters have the added effect of refilling 35% of your shield HP whenever your shields are depleted, with a cooldown of 5 minutes.

This upgrade stacks with itself and with Energy To Shield Converter additively (if you have 1000 shields and you install 2 upgrades, +100% each, you'll have 3000, not 4000 shields).

System Upgrades
Battery Upgrade, C43 Object Detector, Cargo Upgrade, Energy To Shield Converter, Engine Upgrade, Generator Upgrade, Improved Trading System, Mining System, Quantum Hyperspace Upgrade, Radar Upgrade, Scanner Upgrade, Shield Booster, Shield Reinforcer, Stabilizing Mainframe Wiring, Tractor Beam Upgrade, Turret Control System, Velocity Security Control Bypass, XSTN-K