Why? Just buy one that fits into downtime storage and you have to find something to fix it inside the frame.
That's right. But it also has to be a power bank (with Power Delivery and 12v output). It should also have 20,000 mAh so that it lasts at least 10 hours in normal light.
@darario, Thanks, I'll take a look.
Edit: Okay, these 3S LiPo battery packs are clearly too weak. So it should be at least a 10,000 mAh or, better yet, a 20,000 mAh battery.