Was using to charge laptop. Worked for 10mins then stopped. Left it a couple of days then tried again in case it was an overheat shutdown, still no joy. Packing list says it comes with a fuse so curious if it's as simple as changing that but no obvious access to change fuse. Would return but it was a while since I needed to use this so already outside the return window and no obvious way to contact the seller so seems I need to just buy another one from another seller and hope for the best.