Kuulaa Power Bank Ultra Slim, 0.28 in MagSafe PowerBank 5000 mAh, PD20W Small Power Bank, Magnetic Wireless External Mobile Phone Batteries for iPhone 16 Pro/15/14/13/12 Series (Black)

I've been using the one below for a few years now. The stays mounted on my phone in my pocket and in my hand when using it. I mount a MagSafe ring on the top of the battery so that I can mount my MagSafe two card wallet on it when the battery is on the phone. It weighs 110g, and is 7.1mm thick. Most other 5000mAh batteries are around 10mm thick. Those 3mm actually do matter in my pocket, especially with my wallet on top. The only drawback to it is it isn't CCC rated so can't be used for a trip to China. https://www.amazon.com/dp/B0F59FD6PS

I use the really thin MagSafe battery in the link below. I just put it on my phone when starting out so the phone trickle charges from the battery all day while in my pocket or while I am using it. I put a MagSafe ring on the top of the battery so I could mount my MagSafe wallet on the battery while it is on my phone as well. https://www.amazon.com/dp/B0F59FD6PS