Any Cree headtorch is usb chargeable. I carry a power bank for mine when hill walking but I also bought spare batteries and a charger.
------------- Hypercamp Alaska
Vango Force 10 mk3
Vango F10 Helium 1
Coleman Cobra Pro 3
Coleman Cobra 2
Naturehike Star River 2
Eureka! Solitaire
Dutch army goretex bivvy bag
Not really a torch as such but I picked up a goal zero micro lantern in Go Outdoors recently. Worked very well as a tent light plus its small enough to hold in your hand to take to the toilet etc. That particular model wouldn't be that great as a spot beam although on full power it is pretty bright. Has a choice of 2 or 4 led's on - and then depending on which you've chosen you can then dim it down. We were away for a week and I was turning it on dimmed on 2 LED's when we left the tent at about 7pm each evening and leaving it on until gone 10pm when I turned in on my return. I think it had just one of its 4 charge lights gone out by the end of the week with no charging.
They do a more expensive version with a torch beam built into the top but haven't tried that one so can't comment on it.