Anker Zolo Power Bank (10K, 30W)

I had the MagSafe apple battery and while it was slim and fit right on my phone, it didn't work well. I got this power bank for a trip and was shocked at how fast it charged my phone and how many times I could use it before I had to recharge it. the 10K was plenty for just charging my phone, my brother got the 20K and it felt like overkill imo and was a lot bigger.