I have a question bout the Janty stick v2 before I buy it. Since it doesn't come with a charger for the batteries, when using the usb pass thru set up, like attaching the mini usb to a usb port, Does this charge the batteries? I currently have pen style rn4072 with usb passthru with the apc mobile power pack. If i were to plug the Janty.V2 into my power pack will it CHARGE the batteries inside it? Thus not buying a charger because it doesnt include one.