3 ms·

Something like this 50Ah battery pack? https://www.amazon.com/Laptops-External-50000mAh-Portable-Notebook/dp/B073R6NKLW https://www.amazon.com/Laptops-External

• PaulHoule 9y ago
  That is close. The single 12V port packs enough amperage that I could wire the two devices in parallel. I'd still have to make cables to connect to the devices. (The phone in question is a cordless phone connected to a landline. It probably should take usb-c but it does not.)
• bartvk 9y ago
  Mike Gyver sells some interesting batteries: http://mikegyver.com/ http://mikegyver.com/