This functionality is enabled in the system setup under the On Board Devices heading. You can select how much of the battery's charge can be used as well (pictured below). If you set the USB PowerShare to 25%, the external device is allowed to charge until the battery reaches 25% of full capacity
If you still experience issues after completing these steps please send an e-mail to AWCC-Resolution_Experts@Dell.com (for US and Canada customers only), with your service tag, phone number and proper time to reach you and we will be contacting you shortly.
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