The Palmer BATPACK is purpose-designed for guitar and bass players to provide ultra-quiet power to pedalboards and high current draw stompboxes. Utilizing advantageous lithium polymer battery technology and specially designed active filtering circuitry, they are absolutely free from buzz, hiss or whine unlike lesser power bank designs. The BATPACK comes in a rugged low-profile aluminium enclosure and delivers 500 mA each from electrically separated and regulated 9 volt DC centre negative barrel outputs. It features short circuit protection, 5-segment battery status indication and a convenient type A USB port for charging smartphones or tablets. A charger is included.