Obviously YMMV but the stats below represent what I have found with mine - and for what it's worth this was a very tedious undertaking which I only did because I knew that it would be worth it ultimately.

When I bought it, I found that the multiple phone charges I could get from it made it really useful when I was away from power, especially if I was using GPS on my phone, or I needed to charge more than one device simultaneously. But Anker are a very dependable brand, and the performance I have had long term out of my existing PowerCore has been faultless. It also allows chargers with only 15V support, such as the Switch’s own AC adapter, to recharge this power bank. It can charge two devices simultaneously but lacks many of the other features and functions present in today's best models. This sub is about overnight backcountry backpacking, with a focus on moving efficiently, packing light, generally aiming at a sub 10 pound base weight, and following LNT principles.

Superior Safety: Anker’s comprehensive MultiProtect safety system includes overcharge protection, short circuit protection, temperature control, and more.

The Anker PowerCore Essential 20000 PD is a good value option for some, depending on your devices and needs. FYI - unit weight using my own scale, and not including any cables / pouch; while I also deliberately ran down the device to 0% and charged it fully using the 5W charger the first time, instinctively thinking that this is a good idea somehow? Ultra-High Cell Capacity: The massive 20,000mAh cell capacity provides 5 charges for iPhone 12, more than 4 full charges for Samsung Galaxy S10, and over 2 and a half charges for iPad mini 5. Our MultiProtect safety system combines high-voltage protection, current regulation, temperature control, and more to keep you and your devices safe.This battery pack has a claimed capacity of 20,000 milliamp-hours (mAh), but we could only get around 67% of that or 13,416 milliamp-hours of this with our simulated load set to pull 2.