Place it midway through a gameplay edit, right after a quiet looting beat and before the action restarts. Follow it with the Enemy Spotted Sound Effect to signal contact, then cut back to combat sounds so the recharge reads as preparation instead of downtime in the sequence.
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This clip is a wall-mounted HEV charger in action, a roughly eight-second run of mechanical activation followed by pulsing electronic tones as suit power flows back in. It feels industrial and reassuring, like a safe pause to recover before heading back out. It comes from Half-Life 2, Valve's 2004 first-person shooter.