Portable battery bank to charge a laptop? Answered
Let me start off by saying that this problem may well have no possible solution and I'm probably a fool for asking.
I was wondering if there's any simple(ish) way to use an external battery bank with 2 USB ports on it to charge a laptop? The bank has 18,000mAh of capacity, one 2.1A, 5V USB port and one 1A, 5V USB port (total 15.5W). The laptop charger in question runs at 19.5V, 2A DC (total of 39W) and the laptop battery has a 3800mAh rating.
Thanks in advance for any replies :)