Customized Power Bank, Sybil UL Certified 4000 mAh Slim Power Bank - Aluminum, 4000 mAh personal charger for smartphone and tablet devices. Charge your device on the go anywhere. UL certified with an anodized aluminum housing and arrives in an individual box. Connect any USB cable, or use the included Micro USB cable to recharge devices and the power bank itself. Lithium ion grade A non-recycled battery with auto on off overcharging function. Outputs 5 Volts/1.0 Amp. ... #CA3109 $14.97/each.