It’s annoying when my tab go dead and there isn’t any wall power source around. Then an external battery pack is a must have. I’m looking for an external battery pack then I can put it in my bag as backup power when out for camping. I’ve tried Anker Astro E4, but it can’t charge my tab. Anyone has a good external battery?
Are you talking about battery backup for a tablet PC? Not sure how this relates to robotics…