Godox V860IIC TTL Li-Ion Speedlite for Canon
A customer review reads, "I own the Godox 685 speedlite and it had been fantastic but rechargeable batteries were letting me down for the type of subjects I photograph. I decided to upgrade to the lithium battery version, the 860, and this speedlite is absolutely fantastic. I highly recommend the upgrade to the 860 and you will not regret it. I have a couple other speedlites, but this is now my favourite. I highly recommend." Note that Deb shoots animals and when for instance photographing dogs she needs to be firing super rapidly, so even AA rechargeable batteries struggle to keep up.