AKKU 30957: Battery for JBL Charge, Li-Po, 6000 mAh at reichelt elektronik
AKKU 31189: Battery for JBL Charge 3, Li-Po, 6000 mAh at reichelt elektronik
JBL GTO 6000 - AMP Performance
Synergy Digital Speaker Battery, Works with JBL GSP1029102 Speaker, (Li-Pol, 3.7V, 6000 mAh) Ultra High Capacity, Compatible with JBL GSP1029102 Battery - Walmart.com
A6000GTI - JBL 1 Ch 6000 Watts Amplifier
World's Most Powerful Car Audio Amplifier (2004) JBL Crown A6000Gti - YouTube