The Barrel Battery

Brass Knuckles Verified independent store

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550 mAh: stores more charge and more power How to Use: Power On/Off: Press the top button 5 times. Voltage Adjustment: Use the + / - keys (hold for faster adjustment). Auto Shut-Of f: Exceeds 10 seconds, displays “timeout.” Low Battery: Screen flashes 3 times. Charging: Type-C port (bottom). Show more